Table 3.
Association of social background, expectations, risk behaviors, and sexual lifestyle with OC-only use rather than condoms at first intercourse, reported by girls in combined data set
| N = 1,590 (all girls reporting condom and/or OC use) | N (column %) in group | N (row %) using OC-only | OR | 95% CI |
|---|---|---|---|---|
| Baseline measures reported at age 13/14 | ||||
| Deprivation scorea | ||||
| none | 421 (25) | 12 (3) | 1.00 | |
| 1 | 490 (30) | 22 (5) | 1.76 | (0.87–3.58) |
| 2 | 438 (28) | 34 (8) | 2.99 | (1.66–5.37)⁎ |
| 3 or 4 | 241 (17) | 17 (8) | 2.88 | (1.29–6.42)⁎ |
| Like school | ||||
| Agree | 1,289 (80) | 62 (5) | 1.00 | |
| Don't agree | 295 (20) | 23 (8) | 1.55 | (0.87–2.75) |
| Regular use of cigarettes, alcohol or cannabisb | ||||
| no | 1,149 (71) | 57 (5) | 1.00 | |
| yes | 386 (29) | 26 (8) | 1.54 | (0.88–2.71) |
| Expect early parenthoodc | ||||
| no | 1,350 (84) | 64 (5) | 1.00 | |
| yes | 217 (16) | 20 (11) | 2.32 | (1.42–3.80)⁎ |
| Expect attend college/universityc | ||||
| yes | 1,038 (64) | 46 (5) | 1.00 | |
| no | 538 (36) | 39 (8) | 1.54 | (0.98–2.42) |
| Sexual behavior reported at age 16 follow-up | ||||
| Frequency of intercourse in last 12 months | ||||
| less than 10 times | 1,085 (66) | 39 (5) | 1.00 | |
| 10+ times | 505 (32) | 44 (11) | 1.45 | (0.95–2.22) |
| Number of sexual partners in last 12 months | ||||
| less than 3 | 1,363 (86) | 57 (6) | 1.00 | |
| 3 or more | 202 (14) | 25 (16) | 2.08 | (1.26–3.42)⁎ |
OR = odds ratio; CI = Confidence interval.
ORs are adjusted for study and arm of trial but not adjusted for other measures in the table.
Deprivation: count of social housing, father left school at 16, mother left school at 16, neither parent in FT employment.
Regular cigarette and cannabis use were highest points on four-point usage scale (“never”, “tried”, “occasional”, and “regular”), regular alcohol was drunkenness once a week or more, representing two highest points on five-point scale (“never”, “once a year”, “once a month”, “once a week”, “more than once a week”).
Expectations were converted to binary from five-point scale (“very likely” to “very unlikely”) of responses to questions asked about expectations for age 18 (SHARE) or age 20 (RIPPLE).
Denotes p < .05.