TABLE 1

Characteristics of Parents and Adolescent Offspring Selected and Enrolled Into the NEFS-G3 Cohort

Parental CharacteristicsAdolescent Characteristics
All NEFS-G2 Parents (n = 1674)G2 Parents With Eligible G3 Offspringa (n = 466)G2 Parents Whose Offspring Were Included in the Analysis Sample (n = 356)Eligible G3 Adolescents (n = 726)Final Analysis Sample of G3 Adolescents (n = 559)
Mean age (SD)39.2 (1.9)40.0 (1.85)39.6 (1.9)14.0 (1.9)14.0 (1.7)
Female, % (n)59.2 (991)71.5 (333)77.8 (277)52.5 (379)52.2 (292)
G2 race/ethnicity
    White, % (n)83.5 (1354)81.8 (372)85.0 (301)
    Nonwhite, % (n)16.5 (268)18.2 (83)15.7 (56)
G2 education
    College or more, % (n)57.7 (937)45.5 (208)49.0 (173)
    High school, % (n)36.4 (591)47.9 (219)46.4 (165)
    Less than high school, % (n)6.0 (97)6.6 (30)5.1 (18)
G2 smoking characteristics
    Lifetime regular smokers, % (n)58.5 (949)64.1 (293)62.4 (222)
    Lifetime nicotine dependence, % (n)39.0 (625)46.1 (207)46.0 (161)
  • a Not included in this column are an additional 101 G2 parents whose adolescent children were ineligible for participation in the study based on living >100 miles from 1 of the study sites or not being a biological child. The prevalence of regular smoking among G2 parents whose children were ineligible for participation (66.7%) was similar to that among G2 parents with eligible children (64.1%).