pediatrics
December 2015, VOLUME136 /ISSUE 6

Parental Monitoring and Its Associations With Adolescent Sexual Risk Behavior: A Meta-analysis

  1. Patricia J. Dittus, PhDa,
  2. Shannon L. Michael, PhD, MPHb,
  3. Jeffrey S. Becasen, MPH, CPHa,
  4. Kari M. Gloppen, PhD, MPHc,
  5. Katharine McCarthy, MPHd, and
  6. Vincent Guilamo-Ramos, PhD, MPH, LCSW, RNd,e
  1. Divisions of aSTD Prevention, and
  2. bAdolescent and School Health, Centers for Disease Control and Prevention, Atlanta, Georgia;
  3. cDepartment of Pediatrics, University of Minnesota, Minneapolis, Minnesota; and
  4. dCenter for Latino Adolescent and Family Health, and
  5. eSilver School of Social Work, New York University, New York, New York

Abstract

CONTEXT: Increasingly, health care providers are using approaches targeting parents in an effort to improve adolescent sexual and reproductive health. Research is needed to elucidate areas in which providers can target adolescents and parents effectively. Parental monitoring offers one such opportunity, given consistent protective associations with adolescent sexual risk behavior. However, less is known about which components of monitoring are most effective and most suitable for provider-initiated family-based interventions.

OBJECTIVE: We performed a meta-analysis to assess the magnitude of association between parental monitoring and adolescent sexual intercourse, condom use, and contraceptive use.

DATA SOURCES: We conducted searches of Medline, the Cumulative Index to Nursing and Allied Health Literature, PsycInfo, Cochrane, the Education Resources Information Center, Social Services Abstracts, Sociological Abstracts, Proquest, and Google Scholar.

STUDY SELECTION: We selected studies published from 1984 to 2014 that were written in English, included adolescents, and examined relationships between parental monitoring and sexual behavior.

DATA EXTRACTION: We extracted effect size data to calculate pooled odds ratios (ORs) by using a mixed-effects model.

RESULTS: Higher overall monitoring (pooled OR, 0.74; 95% confidence interval [CI], 0.69–0.80), monitoring knowledge (pooled OR, 0.81; 95% CI, 0.73–0.90), and rule enforcement (pooled OR, 0.67; 95% CI, 0.59–0.75) were associated with delayed sexual intercourse. Higher overall monitoring (pooled OR, 1.12; 95% CI, 1.01–1.24) and monitoring knowledge (pooled OR, 1.14; 95% CI, 1.01–1.31) were associated with greater condom use. Finally, higher overall monitoring was associated with increased contraceptive use (pooled OR, 1.42; 95% CI, 1.09–1.86), as was monitoring knowledge (pooled OR, 2.27; 95% CI, 1.42–3.63).

LIMITATIONS: Effect sizes were not uniform across studies, and most studies were cross-sectional.

CONCLUSIONS: Provider-initiated family-based interventions focused on parental monitoring represent a novel mechanism for enhancing adolescent sexual and reproductive health.

  • Abbreviations:
    CI
    confidence interval
    OR
    odds ratio
  • Youth in the United States are disproportionately affected by negative sexual and reproductive health outcomes that warrant greater attention from physicians, nurses, and other health care providers. Although young people aged 15 to 24 years represent a quarter of the sexually experienced population, they account for nearly half of all new sexually transmitted infections.1 Rates of sexually transmitted infections, such as chlamydia, gonorrhea, and HIV, among people aged 15 to 24 years are unacceptably high, although current surveillance data show signs of potential progress in reducing rates for young people.1,2 In 2012, the highest rate of new HIV diagnoses occurred among 20- to 24-year-olds.2 Despite notable progress in reducing teen pregnancy,3 the US teen pregnancy rate continues to be the highest among the developed world.4 Each year ∼750 000 teens <20 years old become pregnant in the United States, and more than three-quarters of these pregnancies are unplanned.3,5 These data highlight the sexual and reproductive health needs of young people as a significant public health issue requiring renewed and ongoing focus. Complicating this problem is the perception by many, including parents, that adolescents are generally healthy and in less need of health care, along with the lower prioritization of adolescent preventive health care in many medical settings.6 Increasingly, however, physicians and other health care providers have begun to recognize the importance of adolescence as a distinct developmental period for the onset of long-term health trajectories that contribute to disease morbidity and mortality in adulthood.79 Sorely needed are focused interventions that provide specific guidance to health care providers regarding how best to support adolescent health.

    Adolescent sexual and reproductive health not only is central to the immediate health of teens but also has implications for shaping future adult health. Behaviors initiated in adolescence are often directly linked to disease burden in adulthood. For example, it is estimated that nearly 70% of premature deaths in adulthood are associated with lifestyle factors initiated during adolescence.10 Adolescents are particularly vulnerable to health-related risks because of behavioral decision-making that is largely influenced by the broader contexts in which they are embedded. Reinforcing contexts supportive of positive youth development and the prevention of adolescent problem behavior will decrease the likelihood of significant disease burden during adolescence and in later life.9 For youth, among the most influential of these contexts is the family and, in particular, parents.1114 Interestingly, both parents and adolescents indicate that their health care providers are among the most trustworthy and expert sources of guidance regarding the promotion of health and overall well-being.1517 Therefore, research highlighting opportunities and specific mechanisms for triadic interventions, defined as provider-initiated efforts targeting adolescents and their families, is warranted and addresses a gap in the scientific literature. The dearth of empirically supported guidance for the development and implementation of triadic interventions is a significant gap in our nation’s current efforts to reduce sexual and reproductive health disparities among youth.

    A large evidence base supports the positive impact of parents on the sexual and reproductive health of youth.12,13,1820 Furthermore, research suggests that parents value and seek out practical guidance from their adolescent children’s health care providers in supporting adolescent sexual and reproductive health.15,16,21 Recently, some research has highlighted the importance of provider endorsement of effective parenting in support of adolescent health.15,16,21,22 One of the core mechanisms by which parents modify sexual decision-making among teens is parental monitoring.2325 Although there is no single definition of parental monitoring, 2 aspects of monitoring have emerged as central, with implications for teen behavior. These are a global form of parental monitoring, parental knowledge of adolescents’ companions, whereabouts, and activities, and a behavior-specific form of monitoring, enforcement of rules about friends and dating.26 Youth who report higher levels of these forms of parental monitoring are more likely to report delaying the onset of sexual activity and to report use of condoms and contraceptives.24,25,27,28 However, it is unclear whether 1 form of monitoring is more effective than another, or whether parental monitoring effects on youth vary by gender, age, or sexual experience. Given the significant health consequences that result from risky sexual behavior in adolescence, greater empirical evidence on the role and specific components of parental monitoring is needed to inform the development and delivery of effective triadic interventions.

    This meta-analysis examines the relationship between parental monitoring and adolescent sexual behavior. We evaluate whether specific types of parental monitoring (ie, global knowledge of activities or enforcement of sexual behavior-specific rules) and overall parental monitoring have a differential effect on adolescent sexual intercourse, condom use, and contraceptive use, thereby also exploring the extent to which an adolescent’s sexual experience is an important factor in determining parental influence. We also examine whether the age or gender of adolescents is associated with the strength of monitoring effects on sexual behavior.

    Methods

    Data Sources

    A Centers for Disease Control and Prevention research librarian and investigators conducted a computerized literature search of Medline, Cumulative Index to Nursing and Allied Health Literature, PsycInfo, Cochrane, Education Resources Information Center, Social Services Abstracts, Sociological Abstracts, Proquest, and Google Scholar databases using key terms related to parental monitoring practices (eg, monitoring, rules, enforcement, supervision) and adolescent sexual behavior (eg, sexual intercourse, condom and contraception use). Database search results that provided lists of references that cited eligible studies and references of eligible studies for inclusion were searched to identify additional studies not identified in the computer-based search.

    Inclusion Criteria and Study Selection

    Included studies were published in English between January 1984 and December 2014. The year 1984 was identified as the starting point for the search because the seminal study by Patterson et al29 on parental monitoring was published that year. We focused on adolescents aged 10 to 19 years old (middle and high school age), and examined the association between parental monitoring and ≥1 of the following adolescent sexual risk behaviors: ever engaged in sexual intercourse, condom use, contraceptive use, intention to engage in sexual intercourse, frequency of sexual intercourse, number of sexual partners, and sexually transmitted infection and pregnancy outcomes. Studies that examined both condom and contraceptive use were required to report these data as separate outcomes. Condom and contraceptive use was not measured uniformly across studies and could include differing time frames of recall (eg, past year, last intercourse) and a list of individual methods (eg, birth control pill, patch, injections, intrauterine device) as well as a general measure of pregnancy prevention. We imposed no restriction on the type of parental monitoring examined (ie, knowledge of companions, whereabouts, and activities; enforcement of rules; direct supervision; youth disclosure; and parent solicitation). We did not attempt to contact authors for original data or include conference proceedings; however, unpublished dissertations were eligible for inclusion. We excluded studies that did not take place in the United States or in a country with a comparable Western culture and public health infrastructure (eg, Canada, Australia, Western European countries). We also excluded studies focused specifically on sexual minority youth because parenting behaviors may be different for this population.

    After enumerating all eligible studies by sexual risk behaviors and parental monitoring types, we found studies that examined ever engaging in sexual intercourse, condom use, and contraceptive use to be the only outcomes with the appropriate number of studies from which to analyze data. Subsequently, from these studies, parental knowledge, mainly concerning child whereabouts, and parental enforcement of rules were the most prevalent parental monitoring types. Data extraction and analysis were limited to studies that focused on these parental monitoring types and sexual risk behaviors. Analyses of monitoring were conducted on an overall summary of parental monitoring and on the knowledge component and rules component separately.

    Data Extraction

    Articles were independently reviewed for inclusion by 4 authors (P.J.D., S.L.M., J.S.B., and K.M.G.) using abstracted study characteristics (ie, source, study design, sample characteristics, parental monitoring measures, adolescent sexual risk behavior measures, and analytic strategy). Using a structured coding sheet, 3 authors (P.J.D., S.L.M., and J.S.B.) simultaneously abstracted additional information (ie, effect size data) from eligible studies. Study quality was determined by the sum total of scores given for study design, sample size, sampling design, missing data, and reported psychometric properties of parental monitoring measures. The possible range of methodological quality scores was from 5 to 15. The actual range of scores from our studies was 6 to 14. A score of ≥9 was selected a priori to identify high-quality studies.

    In studies that reported measures for both parental knowledge and enforcement of rules, data were abstracted for each association with a sexual risk behavior. Associations reported separately by gender were also abstracted. To reduce potential confounding and bias in our summary estimates of observational studies, we preferred adjusted estimates that controlled for known demographic factors over crude estimates.30 In studies where parental monitoring scores for both parents and adolescents were reported, the adolescent score was used. Studies that used large public data from national surveys, such as the National Longitudinal Study of Adolescent Health, were reviewed again to ensure that participants across the studies were not represented twice in the analysis. To ensure accuracy, 1 author (K.M.G.) blindly reviewed 25% of studies. Discrepancies in the abstraction were resolved by group consensus. The current meta-analysis followed the Meta-analysis of Observational Studies in Epidemiology checklist, and the study selection flowchart was adapted from the Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement.31,32

    Data Analysis

    All analyses were performed with Comprehensive Meta-Analysis software (Biostat, Englewood, NJ).33 We examined the overall effect of parental monitoring on each adolescent sexual risk behavior outcome (ie, sexual intercourse, condom use, and contraceptive use). We stratified the analysis to examine effect sizes for the different types of parental monitoring (ie, knowledge vs rules), and, number of studies permitting, gender and age, categorized as middle school (≤14 years old) and high school (>14 years old), were examined to determine their role in parental monitoring and sexual behavior. The analysis used a mixed effects model33 in that for each sexual behavior outcome, pooled effect sizes for each parental monitoring type were calculated with the random effects model, then combined under the fixed effects model to calculate an overall summary effect size for overall parental monitoring.

    Heterogeneity was assessed with the Q test statistic and I2 values. The amount of heterogeneity, indicated by the I2 value, can be interpreted with Higgins’s index: I2 values of 25%, 50%, and 75% correspond to low, moderate, and high heterogeneity, respectively.34 We reran the analyses, removing 1 study at a time, observing how much each study accounted for heterogeneity. By using this process we identified potential outliers. Sensitivity analysis based on study quality and removal of outliers was used to address heterogeneity and increase the precision of the summary estimates. Metaregression was also used to determine whether age was a source of excess heterogeneity.

    Results

    Search Results

    The literature search yielded 2142 studies. After we excluded duplicates and screened 1739 abstracts by using a standardized coding sheet, 60 studies remained for full text review (Fig 1). Thirty eligible studies were identified, contributing 49 effect sizes with 40 625 participants (Table 1).24,25,27,28,3554 We narrowed our focus to studies that examined the outcomes of sexual intercourse, condom use, and contraceptive use because too few examined other sexual behaviors as they related to parental monitoring (eg, intentions to engage in intercourse, n = 2; frequency of intercourse, n = 1). Likewise, the majority of the studies examined parental monitoring knowledge (n = 20) or enforcement of rules (n = 10). Few studies included parental solicitation, youth disclosure, or supervision as they related to sexual behaviors; therefore, these 3 types of parental monitoring were not included in the meta-analysis. Descriptions of included studies by sexual risk behavior are listed in Table 1. We identified 24 studies evaluating 30 associations between parental monitoring and adolescents’ report of having engaged in sexual intercourse.25, 27, 28, 3640, 42, 43, 45, 46, 48, 50, 51, 53, 5562 We treated the 30 effect sizes as separate data points for analysis (19 for knowledge, 11 for rules). For condom use, we identified 9 studies evaluating 11 associations (6 for knowledge, 5 for rules).24, 25, 28, 37, 38, 47, 50, 52, 57 For contraceptive use, we identified 6 studies with 8 associations (3 for knowledge, 5 for rules).24,25,35,40,41,54 In total, 18 studies were cross-sectional and 12 were longitudinal. The age of adolescents ranged from 10 to 17 years. The analytic sample sizes of the studies ranged from 106 to 10 575, with the majority >300.

    FIGURE 1

    Selection process for study inclusion in the meta-analysis.

    TABLE 1

    Characteristics of Studies Included in Meta-Analyses

    Parental Monitoring and Adolescent Sexual Intercourse

    Figure 2 shows the results of the mixed-effects meta-analysis examining the association between overall parental monitoring, type of parental monitoring, and adolescents’ reports of ever having sexual intercourse. Higher overall parental monitoring was associated with a decrease in the number of adolescents ever having sex (pooled odds ratio [OR], 0.68; 95% confidence interval [CI], 0.61–0.75). Both higher monitoring knowledge (pooled OR, 0.72; 95% CI, 0.63–0.83) and enforcement of rules (pooled OR, 0.61; 95% CI, 0.52–0.72) were associated with a decrease in the number of adolescents ever having sex. Parental enforcement of rules had a stronger association with adolescents ever having sex than parental knowledge (0.61 vs 0.72, respectively); however, the difference was not statistically significant (Q value, 2.34; df = 1; P = .13). In an analysis that reflected only male subjects, only female subjects, and both genders, the association of parental monitoring remained significant for male and female subjects (male, pooled OR, 0.66; 95% CI, 0.53–0.82; female, pooled OR, 0.67; 95% CI, 0.54–0.82). Additionally, no significant differences in effect sizes were observed when we compared middle school and high school estimates (Q value, 0.76; df = 1; P = .38).

    FIGURE 2

    Associations between parental monitoring type and adolescent sexual intercourse. *Includes only high-quality studies only (score ≥9) and excludes outliers (Rose et al, Rai et al, Longmore et al, and Morales-Campos et al).

    High levels of heterogeneity were observed between all the studies (I2 = 89%), between studies of parental knowledge (I2 = 87%), and between studies of enforcement of rules (I2 = 74%). Sensitivity analyses, in which we removed outliers and low-quality studies, still showed that higher parental monitoring was associated with a decrease in adolescents ever having sex (pooled OR, 0.74; 95% CI, 0.69–0.80). Higher monitoring knowledge (pooled OR, 0.81; 95% CI, 0.73–0.90) and higher rules (pooled OR, 0.67; 95% CI, 0.59–0.75) remained significantly associated with a decrease in adolescents’ ever having sex, with the enforcement of rules having a statistically significantly stronger inverse association with adolescents’ ever having sex than monitoring knowledge (Q value, 5.96; df = 1; P < .05). Heterogeneity was also improved for overall estimates, parental knowledge, and enforcement of rules (I2 = 55%, 43%, and 44%, respectively). The meta-regression analysis of average age did not yield significant results for overall monitoring, parental knowledge, or enforcement of rules. Regression analyses across studies that reflected only male subjects, only female subjects, and both genders again did not yield significant results, indicating that age and gender were probably not contributors to heterogeneity.

    Parental Monitoring and Adolescent Condom Use

    Figure 3 shows the association between overall parental monitoring, type of parental monitoring, and adolescent condom use. Higher monitoring was associated with increased condom use (pooled OR, 1.16; 95% CI, 1.02–1.33). Parental knowledge (pooled OR, 1.24; 95% CI, 1.04–1.47) was associated with increased condom use; however, enforcement of rules was not (pooled OR, 1.08; 95% CI, 0.91–1.28), and there was no statistical difference between monitoring knowledge and enforcement of rules (Q value, 1.14; df = 1; P = .29). Because of the limited number of studies, analysis of gender and age was not performed.

    FIGURE 3

    Associations between parental monitoring type and adolescent condom use. *High-quality studies only (score ≥9).

    Heterogeneity was substantial for overall monitoring, parental knowledge, and enforcement of rules (I2 = 72%, 70%, and 68%, respectively). When we examined only high-quality studies, effect sizes were slightly attenuated for overall monitoring and parental knowledge (pooled OR, 1.12; 95% CI, 1.01–1.24; pooled OR, 1.14; 95% CI, 1.01–1.31, respectively). Heterogeneity for parental knowledge also improved, from I2 = 72% to I2 = 21%). The meta-regression analysis did not indicate age as a contributor to the observed heterogeneity.

    Parental Monitoring and Adolescent Contraceptive Use

    Higher levels of overall parental monitoring were associated with increased contraceptive use (pooled OR, 1.42; 95% CI, 1.09–1.86) (not shown). Higher levels of parental knowledge was associated with increased contraceptive use (pooled OR, 2.27; 95% CI, 1.42–3.63); however, enforcement of rules was not (pooled OR, 1.13; 95% CI, 0.81–1.57). Because of the limited numbers of studies, sensitivity analysis on age, gender, and study quality was not performed.

    Publication Bias

    Using funnel plots, we examined publication bias for all outcomes and found evidence of asymmetry for sexual intercourse and contraceptive use. We applied Duval and Tweedie’s63 trim and fill procedure, as recommended by Borenstein et al,33 to identify how many studies might be missing from the current meta-analyses. The results showed that 5 studies potentially were missing from the sexual intercourse outcome and 1 from contraceptive use. Results of this analysis produced similar effect sizes with no change in the interpretation of results, suggesting this risk of bias did not significantly affect the cumulative evidence.

    Discussion

    This meta-analysis examined the association between different components of parental monitoring and adolescent sexual risk behaviors. We found that higher levels of parental monitoring were associated with lower likelihood of adolescents ever having engaged in sexual intercourse and greater likelihood of sexually experienced adolescents using both condoms and contraceptives. Significantly less research has focused on the effects of parenting behaviors on adolescent sexual decision-making for youth who are sexually active.21 In this regard, the research reported here is timely and of great utility to the advancement of evidence related to parental monitoring’s effect on sexual behavior for teens with and without sexual experience. In addition, 1 of the primary objectives of the study was to examine different types of parental monitoring to gain a better understanding of how specific parental monitoring behaviors affect adolescent sexual risk behaviors. We found that both global and sexual behavior–specific forms of parental monitoring are important in helping reduce risk behavior. Additionally, we found that parental enforcement of rules about friends and dating (ie, sexual behavior–specific monitoring) was more strongly associated with delaying adolescent sexual intercourse than was parental knowledge of friends, whereabouts, and activities (ie, global parental monitoring), whereas enforcement of rules was not associated with condom or contraceptive use. These findings add to the knowledge base on parental monitoring and help establish the distinct components of monitoring practices and their differential impacts on adolescent behavior.

    We also sought to identify for whom parental monitoring efforts were likely to have the greatest impact. We found that parental monitoring effects are robust across age, gender, and sexual experience, suggesting that parents can positively influence the sexual risk behavior of boys as well as girls, for older as well as younger adolescents, and, as we previously reported, for adolescents who have or have not initiated sexual intercourse. This is an important finding because it cements the importance of parental monitoring efforts for a broad range of adolescents, making it a suitable focal point for triadic interventions intended to be implemented with a broad range of adolescents and their parents. With regard to sexually experienced adolescents, type of monitoring matters, in that enforcement of rules about friends and dating was not found to be associated with condom use or contraceptive use. It appears that establishing and enforcing rules that limit an adolescent’s unsupervised time is effective in limiting opportunities to engage in sex; however, for those who do find those opportunities, rules do not directly affect protective behaviors. However, the more global form of monitoring is associated with increased condom and contraceptive use. Again, these findings may be helpful in developing specific messages about monitoring so as to maximize the impact of provider and parental efforts in supporting adolescent sexual and reproductive health.

    This analysis does not contribute to our understanding of how and why monitoring serves as a protective factor for adolescents. However, parents who engage in active monitoring behaviors that lead to greater knowledge about their adolescent’s companions, whereabouts, and activities and who enforce rules that limit opportunities for engagement in risk behavior are engaging in behaviors that emphasize demandingness and responsiveness, reflecting an authoritative parenting style that has been found to facilitate the development of personal, social, and academic competencies in adolescents.64,65 Protective behaviors such as delaying sexual initiation and using condoms and contraceptives to prevent STIs and pregnancy may reflect these competencies, which may be affected by these parenting practices. The mechanism for these effects is unclear; however, more complex models of parenting influences that incorporate communication and relationship quality may help us understand the underlying mechanisms responsible for these findings.66

    There were some limitations to our review. Although our data extraction method did attempt to use effect size data that best controlled for common demographic characteristics and relevant covariates, studies did not control for the same things, and in some cases only crude effect size data were reported. Additionally, the majority of our studies were cross-sectional, which limits inferences of causality. Finally, our findings are focused solely on heterosexual adolescents, because of the limited number of studies of sexual minority youth. A recent study suggests that parenting behaviors, including parental monitoring, may not be protective for sexual minority youth, highlighting the need for additional research on this high-priority population.67 Despite these limitations, the current research provides important guidance for the delivery of triadic interventions in clinical settings. Although implementation of triadic interventions has been limited in addressing adolescent sexual and reproductive health, evidence suggests that such approaches can be implemented effectively and that these interventions influence adolescent sexual behavior in positive ways.15,16,21,22 Additional research is needed on the protective effects of parental monitoring efforts, including examination of a broader range of monitoring behaviors and a broader range of adolescent outcomes. Of particular importance will be future research that evaluates how parental monitoring and broader parenting behaviors can be reinforced effectively in support of adolescent health through triadic interventions.

    Conclusions

    Numerous professional health and provider organizations advocate for increased parental involvement and provider–parent collaboration in adolescent health care.23,6870 Despite strong endorsement, triadic models of adolescent health care remain limited. The results of the current study suggest that provider encouragement of parents to monitor their children through efforts to gain knowledge of their whereabouts, companions, and activities, and through the use and enforcement of rules about friends and dating, will help protect adolescents from the negative consequences of engaging in sexual risk behavior. Provider-initiated interventions targeting both adolescents and their parents may increase effectiveness in reducing negative adolescent sexual and reproductive outcomes by incorporating both global and sexual behavior–specific parental monitoring components. Primary care physicians, nurses, and other providers are uniquely positioned to convey this message to parents and to provide them with targeted resources addressing key issues in adolescent sexual and reproductive health (ie, information about contraceptives) and through reinforcement of parenting behaviors associated with adolescent health outcomes (ie, monitoring). The development of brief educational tools such as fact sheets, pamphlets, and digital and online resources for parents and endorsed by providers represents a feasible method for building stronger collaboration with both adolescents and their parents while addressing provider time and workload constraints in the majority of adolescent health care settings. The development of focused triadic interventions is warranted and represents a novel strategy for improving the overall health of our nation’s adolescents and an important paradigm shift in reducing adult morbidity and mortality.

    Footnotes

      • Accepted September 10, 2015.
    • Address correspondence to Patricia J. Dittus, PhD, Centers for Disease Control and Prevention, 1600 Clifton Rd, MS E-44, Atlanta, GA 30333. E-mail: pdittus{at}cdc.gov
    • Dr Dittus conceptualized and designed the study, developed search terms and inclusion criteria, reviewed study abstracts, coded articles, and drafted the initial manuscript; Dr Michael conceptualized and designed the study, developed search terms and inclusion criteria, reviewed study abstracts, coded articles, and contributed to sections of the initial manuscript; Mr Becasen conducted literature searches, reviewed study abstracts, coded articles, performed all data analyses, drafted the Methods and Results sections of the initial manuscript, and created all tables and figures in the manuscript; Dr Gloppen developed search terms and inclusion criteria, reviewed study abstracts, and coded articles; Ms McCarthy coded articles and contributed to sections of the initial manuscript; Dr Guilamo-Ramos conceptualized and designed the study and contributed to sections of the initial manuscript and subsequent revisions; and all authors approved the final manuscript as submitted.

    • The views and conclusions in this article are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention (CDC).

    • FINANCIAL DISCLOSURE: The authors have indicated they have no financial relationships relevant to this article to disclose.

    • FUNDING: No external funding.

    • POTENTIAL CONFLICT OF INTEREST: The authors have indicated they have no potential conflicts of interest to disclose.

    References