TABLE 1

Demographic Characteristics, Substance Use, and Knowledge at Baseline Among Study Participants

All (n = 339)Sexually Experienced at Baseline (n = 195)Sexually Inexperienced at Baseline (n = 144)P valuea
N (%)Mean (SD)N (%)Mean (SD)N (%)Mean (SD)
Demographic characteristics
 Age16.8 (2.5)18.1 (2.2)15.0 (1.4)<0.0001
 Race0.01
  White56/339 (16.5)22/195 (11.3)34/144 (23.6)
  Black259/339 (76.4)159/195 (81.5)100/144 (69.4)
  Other24/339 (7.1)14/195 (7.2)10/144 (6.9)
 Hispanic11/339 (3.2)10/195 (5.1)1/144 (0.7)0.03
 Appalachian descent13/339 (3.8)4/195 (2.1)9/144 (6.3)0.05
 Have health insurance286/339 (84.4)162/195 (83.1)124/144 (86.1)0.45
Substance use
 Cigarettes
  Ever smoked >100 cigarettes34/339 (10.0)30/195 (15.4)4/144 (2.8)0.0001
  Smoked >1 d in past month40/339 (11.8)36/195 (18.5)4/144 (2.8)<0.0001
 Alcohol: ever used170/339 (50.2)125/195 (64.1)45/144 (31.3)<0.0001
 Marijuana: ever used69/339 (20.4)65/195 (33.3)4/144 (2.8)<0.0001
Knowledge about HPV and HPV vaccines
 Knowledge (12-item scale)5.3 (2.6)5.6 (2.7)4.9 (2.4)0.02
  • a P value represents the comparison between sexually experienced and sexually inexperienced participants; a χ2 or Fisher’s Exact test was used to compare proportions and a Wilcoxon or t test to compare means.