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* Department of Dermatology, School of Medicine, and Department of Epidemiology and Biostatistics, School of Public Health, Cancer Prevention and Control Center, Boston University, Boston, Massachusetts
Channing Laboratory, Department of Medicine, Brigham and Womens Hospital, Harvard Medical School, Harvard School of Public Health, Boston, Massachusetts
Department of Pediatric Oncology, Dana Farber Cancer Institute, Boston, Massachusetts
|| Dermatology Service, Department of Medicine, Memorial-Sloan Kettering Cancer Center, New York, New York
¶ Dana-Farber Cancer Institute and Harvard School of Public Health, Boston, Massachusetts
# Centers for Disease Control and Prevention, Atlanta, Georgia
| ABSTRACT |
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Methods. A cross-sectional study, from all 50 states, of 10 079 boys and girls 12 to 18 years of age in 1999. Data were collected from self-report questionnaires with the children of the participants from the Nurses Health Study (Growing Up Today Study).
Results. The prevalence of sunscreen use was 34.4% with girls more likely to use sunscreen than boys (40.0 vs 26.4, odds ratio: 1.86; 95% confidence interval: 1.702.03). Eighty-three percent of respondents had at least 1 sunburn during the previous summer, and 36% had 3 or more sunburns. Nearly 10% of respondents used a tanning bed during the previous year. Girls were far more likely than boys to report tanning bed use (14.4 vs 2.4), and older girls (ages 1518) were far more likely than younger girls (ages 1214) to report tanning bed use (24.6% vs 4.7). Tanning bed use increased from 7% among 14-year-old girls to 16% by age 15, and more than doubled again by age 17 (35%; N = 244). Multivariate analysis demonstrated that attitudes associated with tanning, such as the preference for tanned skin, having many friends who were tanned, and belief in the worth of burning to get a tan, were generally associated with sporadic sunscreen use, more frequent sunburns, and increased use of tanning beds.
Conclusions. Our findings suggest that many children are at subsequent risk of skin cancer because of suboptimal sunscreen use, high rates of sunburning, and tanning bed use. Recommendations in the United States for improved sun protection and avoidance of tanning beds and sunburning, which began in the early 1990s, have been primarily unheeded. Nationally coordinated campaigns with strong policy components must be developed and sustained to prevent skin cancer in a new generation of children and adolescents.
Key Words: melanoma skin cancer prevention children epidemiology
Abbreviations: UV, ultraviolet GUTS, Growing Up Today Study NHS II, Nurses Health Study II SPF, Sun Protection Factor; OR, odds ratio CI, confidence interval
| INTRODUCTION |
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Although skin cancers are rare in individuals under the age of 20, there is evidence to support a role of sun exposure during early life and subsequent risk of skin cancer during adulthood.69 Furthermore, patterns of sun exposure seem to be important in the development of these cancers, specifically intermittent sun exposure received during the critical periods of childhood and adolescence.9,10
The effects of sun exposure during early life are important because most of an individuals exposure occurs during childhood and adolescence.11,12 Children spend an estimated 2.5 to 3 hours outdoors each day13,14 and may receive 3 times more annual UV-B rays than adults, because they have a greater opportunity for midday sun exposure during the summer months.13,15 Health behaviors, including unprotected sun exposure, are established early in life and may "track" into adulthood.16,17 Furthermore, there is some evidence to suggest that primary prevention programs to reduce sun exposure are beginning to have a beneficial effect on reducing skin cancer in younger age cohorts.18
Recent recommendations from the Centers for Disease Control and Prevention, the American Cancer Society, the American Academy of Dermatology, the Environmental Protection Agency, and the Skin Cancer Foundation, among others, have called for increased use of sun protection, minimizing sunburns, and avoiding tanning beds.1923
The purpose of the current study was to assess adherence to these new recommendations, and to examine the relationship between sunscreen use, sunburning, and tanning bed use by demographics and psychosocial correlates related to tan-seeking. We hypothesized that adolescents were not adopting these recommendations and that tan-seeking behaviors were related to noncompliance. In addition, we hypothesized that tan-seeking behaviors, including use of tanning beds, would be more prevalent among female adolescents. This is the first study to jointly examine sunscreen use, sunburning, and tanning bed use in US children.
| METHODS |
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The Growing Up Today Study (GUTS) is a longitudinal study that was established in 1996 and originally involved the children and adolescent offspring of women participating in the Nurses Health Study II (NHS II). NHS II is a national longitudinal cohort study of 116 671 female nurses, established in 1989. Letters were first sent to the approximately 40 000 women who participated in NHS II and who had indicated that they had a child between 9 and 14 years of age. Mothers who gave permission for their child to participate provided each childs name, age, gender, and address. These 25 000 children then were sent a packet including a letter inviting them to participate in a new study and a gender-specific questionnaire. Return of a completed questionnaire was considered consent to participate. This study was approved by the Human Subjects Committees at the Harvard School of Public Health and the Brigham and Womens Hospital in Boston, Massachusetts. Mothers who gave permission to contact their children were slightly different from those who did not grant permission in terms of mothers smoking status (8% vs 10%, respectively), age (37.7 vs 37.8 years), and body mass index (25.3 kg/m2 vs 25.7 kg/m2).24
In 1999, 16 625 adolescents of all races (ages 1218) were eligible to complete the survey, and 94% of these were white (N = 15 627). Sunscreen questions were completed by 10 843 respondents, of whom 10 079 were white. The overall response rate for white adolescents was 65%.
Measures
We created a variable based on the childs state of residence and then categorized these into warmer states (N = 13) and cooler states (N = 37; see methodology used elsewhere).25 In general, warmer climates included Hawaii, Southern California, the Southeast, and the Southwest defined as having the highest mean UV Index at the time of survey completion.
In 1999, 7 questions on sun protection attitudes and practices were added to the GUTS questionnaire. The questions, divided into predictors and outcomes were:
Predictors
Outcomes
The primary endpoints of interest included: 1) routine use of sunscreen, 2) the presence of at least 3 sunburns during the past summer, and 3) use of a tanning booth or salon during the past year. The outcomes are further described below:
Data Analysis Plan
Statistical analyses were performed using SAS (SAS Insitute, Cary, NC). All analyses were stratified by gender. We calculated descriptive statistics to describe sun protection practices and attitudes of the study cohort. Univariate and multivariate analyses were performed to evaluate associations between the primary endpoints and demographic factors (age, gender, and residence), skin color (very fair, fair, olive, and dark), and psychosocial factors and attitudes related to beliefs about tanning.
2 analysis tests for categorical data were performed and regression modeling was done to identify the sets of predictor variables for the three primary endpoints. In logistic regression analysis, we evaluated the association between the predictor variables and the trend toward the occurrence of multiple sunburns.
| RESULTS |
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Summary of Practices and Psychosocial Variables
Girls used sunscreen more routinely than boys (40.0% vs 26.3%; odds ratio [OR]: 1.86; 95% confidence interval [CI]: 1.702.03), but were more likely to have received at least 3 sunburns the previous summer, (OR: 2.06; 95% CI: 1.832.32). Girls were far more likely than boys to have used a tanning booth during the past year (14.4% vs 2.4%; OR: 6.99; 95% CI: 5.658.65; Table 1).
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Sunscreen Use
Only one third of the respondents reported routine use of sunscreen during the past summer. Use of sunscreen was inversely associated with age for both boys and girls. Overall, very fair children were more likely than olive-complected and dark-complected children to report routine use (49% vs 29% and 20%, respectively; P < .001). These relationships were consistent when stratified by gender. There were no differences between routine and sporadic users by residence. Children reporting that it was worth getting burned to get a good tan used sunscreen less frequently (21% vs 39%; OR 0.42; 95% CI: 0.370.46) as did those who preferred a tan versus natural or light color (31% vs 44%: OR: 0.57; 95% CI: 0.520.62). Univariate analyses showed strong differences between boys and girls for most variables. Multivariate analysis confirmed that girls, younger children, children with very fair skin and fair skin, children not believing that it was worth burning to get a tan, those preferring natural skin color or a little color, and having friends who were not tanned were more likely to report sunscreen use (Table 2).
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Tanning Bed Use
Nearly 10% of respondents used a tanning bed during the previous year. Girls were far more likely to report tanning bed use and older girls (ages 1518) were far more likely than younger girls to report tanning bed use (24.6% vs 4.7; P < .001). Tanning bed use increased from 7% among 14-year-old girls to 16% by age 15, and more than doubled again by age 17 (35%; P < .001).
A significant trend toward increased tanning bed use for olive- and dark-complected children was observed (OR: 1.90; 95% CI: 1.442.51). This may be partly explained by the fact that olive-skinned children were more likely than very fair children to prefer tanned skin (P < .001). Overall, having friends who tanned was strongly associated with tanning bed use (OR: 4.37; 95% CI: 3.186.00) as was stating that it was worth getting a little burned to get a tan (OR: 2.58; 95% CI: 2.262.96). Of those using tanning beds, 23% used sunscreen routinely compared with 35% among children who did not use tanning beds (P < .001).
Among girls, all 3 psychosocial variables were predictive of tanning bed use. In particular, tanning bed use among girls reporting that it was worth getting burned was nearly double than for those without this belief (22.3 vs 11.3; OR: 2.25; 95% CI: 1.942.60). Similarly, tanning bed use by girls was much higher when they believed that all, most, or some of their friends tanned, (OR: 3.57; 95% CI: 2.475.16) or if they preferred tanned skin, (OR: 4.45; 95% CI: 3.385.85). In the multivariate analysis, girls, older age, report of darkest untanned skin, stating that it was worth getting burnt to get a tan, having a preference for tanned skin, and having friends who were tanned remained significant (Table 2).
| DISCUSSION |
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Our study demonstrates that attitudes associated with tanning, such as the preference for tanned skin, having many friends who were tanned, and belief in the worth of burning to get a tan were generally associated with sporadic sunscreen use, more frequent sunburns, and increased use of tanning beds. There seems to be a gender difference as girls are more likely to be influenced by their peer network. In particular, the very high use of tanning beds among older teenage girls merits additional study.
Limitations
Although the results presented here are self-reported, we are less concerned about bias as the respondents report 2 findings of low social desirability-suboptimal use of sunscreen and high rates of sunburning. Furthermore, because these respondents are generally from middle-class families and the children of health professionals, the rates reported in this study may be different from those for other children. However, the lack of generalizability does not invalidate the data or preclude raising general hypotheses for other groups. Third, without data on cumulative exposure and intentional sunbathing, we cannot explain the contradictory finding of higher sunburning rates and more routine sunscreen use by girls. It is possible that facial or body creams, more frequently used by girls, lull girls into a false sense of protection thus enhancing their exposure to the sun. We were also surprised that tanning booth use was higher for olive- and dark-complected children compared with those of fairer skin, and we can only speculate that adolescents use tanning booths to maintain their tanned or darker appearance. Future studies will also need to determine whether children are applying enough sunscreen, using SPF of 15 or more, and seek to corroborate their report of sunscreen use. Finally, sunscreen use was the only type of sun protection examined, therefore overall rates of sun protection may be higher than reported.
Prevalence reported in this study is generally similar to that reported in other studies, although comparisons are limited because of variation in the wording and methodology of other surveys.2637 Coogan et al27 asked a single question on the use of sun protection among 25 000 Connecticut children completing a Health Check survey and found that only 14% of boys and 20% of girls ages 13 to 18 routinely used sun protection. Tanning bed use in this current study is also similar to findings of a population-based survey in Quebec, where rates were highest among women and young people.28 Geller and colleagues29 surveyed lifeguards (median age 19) at poolsites in Massachusetts and Hawaii and found sunburning rates approaching 80%. However, sunburning rates of 83% in this study were markedly higher than parent reported rates of 53% for 10- to 11-year-olds in a Massachusetts coastal town.30
In the United States, selected small-scale interventions for skin cancer prevention in community settings,30,38 outdoor pools29,39 and other recreation facilities40,41 have shown the feasibility of implementing broader programs to change sun protection behaviors. But larger public educational campaigns and especially policy changes are also needed if we are to influence behavior and change social norms.42 After many years, such programs in the Australian State of Victoria have resulted in decreased value of a tan, although adolescents remain the most resistant to changing attitudes regarding the appeal of a tan.43
In 1998, the Centers for Disease Control and Prevention launched the "Choose Your Cover" campaign,19 designed to influence social norms related to sun protection and tanned skin, and to increase awareness, knowledge and behaviors related to skin cancer prevention. Campaign planners conducted formative research with young people and found strongly held beliefs about the benefits of tanned skin, including how it can help one look younger, healthier, sexier, and thinner.19 The glamour and attractiveness of a tan seems to be widespread and seems to be a forerunner in the pathway toward inadequate sun protection and excessive burning. Changing these beliefs is crucial in increasing the acceptability and adoption of sun protection behaviors. In addition, focus group participants viewed sunburns as inconsequential, although few teens knew that sunburns increased ones risk of skin cancer.19
Using multiple, mutually reinforcing strategies holds the most promise for successful sun protection educational programs. Long-term policy, for example, age restrictions on tanning bed use, and environmental changes can help encourage and support changes in attitudes and behaviors.43 Finding few differences between the geographic regions supports a nationally based series of policies and recommendations. Such strategies may include improving sun protection education at US schools37; building sun safe schools,37 parks, and facilities; and incorporating sun safety awareness into everyday events, such as using the daily UV Index in weather, news, and other broadcasts.42,44 Peer education programs in schools, commonly used in tobacco education but sparingly used for sun protection, holds promise for future interventions.
| CONCLUSION |
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| ACKNOWLEDGMENTS |
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| FOOTNOTES |
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Reprint requests to (A.C.G.) Boston University School of Medicine and School of Public Health, 720 Harrison Ave, DOB 801A, Boston, MA 02118. E-mail: ageller{at}bu.edu
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