Table I.
Differences in Laboratory Confirmed STDs, Prior History of STDs, and Sexual Behaviors Between Younger and Older Adolescents
| STDs and sexual behaviors | Younger adolescents (14–17 years) | Older adolescents (18–20 years) | Test statistic (95% CI) | p-value |
|---|---|---|---|---|
| Positive laboratory-confirmed STDa,b | 102 (32.1) | 95 (24.8) | 4.55 (1.03 to 1.99) | .03 |
| Prior history of STDsa,c | 154 (51.6) | 233 (60.8) | 6.07 (0.51 to 0.93) | .01 |
| Frequency of sex (past 6 months)d,e | 17.13 (21.72) | 35.97 (56.56) | 6.01 (12.68 to 25.00) | .001 |
| Frequency of UVS (past 6 months)d,f | 10.02 (18.42) | 25.15 (54.34) | 5.11 (9.31 to 20.95) | .001 |
| No. of sex partners (past 6 months)d | 2.05 (3.14) | 2.28 (1.86) | 1.20 (−0.15 to −0.61) | .23 |
| Has current casual sex partnera | 107 (33.6) | 135 (35.2) | 0.20 (0.70 to 1.31) | .66 |
| General age of sex partnersd | 3.73 (0.72) | 3.80 (0.84) | 1.14 (−0.05 to −0.18) | .26 |
aFrequency (%) presented, test statistic is chi-square.
dMean (SD) presented, test statistic is t-test; sex refers to vaginal sex.
bEffect size calculated by ϕ = .08 and OR = 1.43.
cEffect size calculated by ϕ = −.09 and OR = 0.69.
eEffect size Cohen's d = .45
fEffect size Cohen's d = .37.
UVS = unprotected vaginal sex.