TABLE 3

Prevalence of E-Cigarette Ever-Use (n and Row %) by Usage Groups, With Cell χ2 Tests

Demographic Subgroup (n)Usage Group (Marginal Row %)
NonuserE-Cigarette OnlyCigarette OnlyDual Use
(68%)(17%)(3%)(12%)
Gender
 Female (1029)719 (70%)162 (16%)37 (4%)111 (11%)
 Male (894)595 (67%)167 (19%)16 (2%)116 (13%)
Grade
 9th grade (1104)773 (69%)203 (19%)31 (3%)97 (9%)**
 10th grade (825)544 (65%)128 (16%)23 (3%)130 (16%)***
Family structure
 Single parent (313)177 (56%)**69 (22%)*15 (5%)*52 (17%)**
 Blended family (247)134 (54%)**40 (16%)14 (6%)**59 (24%)***
 Intact family (1146)868 (76%)**165 (14%)*22 (2%)91 (8%)***
 Extended family (218)134 (61%)56 (26%)**2 (1%)26 (12%)
Ethnicity
 Asian American (380)328 (86%)***23 (6%)***5 (1%)24 (6%)**
 Caucasian (316)232 (73%)45 (14%)12 (4%)27 (9%)
 Filipino (595)385 (65%)135 (23%)***12 (2%)63 (11%)
 Native Hawaiian (378)206 (54%)***82 (22%)*13 (3%)77 (20%)***
Parental education
 Lower education (528)320 (61%)*115 (22%)**9 (2%)84 (16%)***
 Higher education (954)a708 (74%)139 (15%)26 (3%)81 (8%)**
  • Asterisks indicate cell departure from expectation, based on cell χ2with 1 degree of freedom. *Indicates cell χ2 significant at P < .05; **P < .01; ***P < .001. Overall χ2 tests are as follows: for gender, χ2 (3) = 10.8, P = .01; for grade, χ2 (3) = 22.9, P < .001; for family structure, χ2 (9) = 112.0, P < .001; for ethnicity, χ2 (9) = 118.3, P < .001; for parental education, χ2 (3) = 38.2, P < .001.

  • a Coding is as follows: lower = up to high school graduate, higher = some college or more.