Table 2.

Demographic comparisons by group (mean, 95% CI)

CharacteristicControl group (N = 50)Research group (N = 53)Drop outs (N = 32)
Age, y37.4 (34.4–41.0)36.6 (33.4–39.2)36.6 (32–41)
Gender
 Male312520
 Female192812
Race/ethnicity (%)
 Caucasian707078
 African American880
 Asian1060
 Other/mixed121622
BMI24.8 (24.5–25.0)26.3 (26.1–26.6)25.8 (23.4–28.2)
Education, y15.7 (14.9–16.1)15.1 (14.6–15.8)14.5 (9–17)
CPD19.9 (17.9–22.0)23.4 (21.5–25.4)24.3 (20.9–27.8)
Years smoked21.4 (17.9–24.8)20.5 (17.5–23.5)19.9 (15.4–24.5)
Menthol, n (%)5 (10)6 (11)3 (9)
FTC nicotine, mg1.0 (0.9–1.0)1.0 (0.9–1.0)1.0 (0.9–1.1)
FTC tar, mg11.6 (10.8–12.3)11.4 (10.6–12.1)11.8 (10.7–13.0)
FTND score5.5 (4.9–6.2)5.6 (5.2–6.1)6.5 (5.7–7.4)a

Abbreviations: BMI, body mass index; CPD, cigarettes per day; FTC, Federal Trade Commission.

  • aSignificant difference at P < 0.05.