Table 3.
Multinomial multivariable logistic regression examining associations with type of contraception use (versus condoms only) at last sexual intercourse, females a
| Weighted | No method/unsure n = 1,929 OR (95% CI) |
Withdrawal only n = 1,241 OR (95% CI) |
Birth control pills only n = 1,550 OR (95% CI) |
DMPA only b n = 339 OR (95% CI) |
Dual methodc n = 885 OR (95% CI) |
|---|---|---|---|---|---|
| Risk Scale | |||||
| 0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 |
| 1 | 0.9 (0.6–1.4) | 0.9 (0.6–1.5) | 0.9 (0.5–1.7) | 0.8 (0.3–2.0) | 1.5 (0.9–2.6) |
| 2 | 0.9 (0.6–1.4) | 0.8 (0.5–1.2) | 1.2 (0.6–2.3) | 1.1 (0.6–2.3) | 1.1 (0.7–1.9) |
| 3 | 1.0 (0.7–1.5) | 0.9 (0.6–1.3) | 1.4 (0.8–2.6) | 1.6 (0.8–3.2) | 1.4 (0.8–2.4) |
| 4 | 1.1 (0.7–1.8) | 1.1 (0.7–1.8) | 1.8 (0.9–3.4) | 1.9 (0.9–4.3) | 1.4 (0.8–2.3) |
| No. of sex partners | |||||
| 1 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 |
| 2–5 | 1.0 (0.8–1.1) | 1.5 (1.2–1.8) | 1.2 (0.9–1.4) | 1.3 (0.9–2.0) | 1.2 (0.9–1.5) |
| 6+ | 1.3 (1.0–1.7e) | 2.9 (2.1–3.9) | 1.9 (1.4–2.5) | 2.6 (1.6–4.2) | 1.3 (0.9–1.9) |
| Age of sexual debut | |||||
| ≥ 17 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 |
| 15–16 | 1.5 (1.2–1.9) | 1.3 (0.9–1.9) | 1.7 (1.3–2.2) | 2.3 (0.9–5.8) | 1.2 (0.9–1.6) |
| 13–14 | 2.3 (1.6–3.1) | 1.3 (0.9–1.9) | 2.4 (1.6–3.5) | 3.4 (1.3–8.7) | 1.7 (1.2–2.5) |
| ≤ 12 | 4.5 (3.2–6.4) | 1.1 (0.7–1.8) | 1.7 (1.0–2.8d) | 2.5 (0.9–7.5) | 1.3 (0.8–2.0) |
| Race | |||||
| Caucasian | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 |
| African American | 0.8 (0.6–1.0d) | 0.5 (0.4–0.7) | 0.4 (0.3–0.5) | 0.8 (0.6–1.2) | 0.5 (0.4–0.7) |
| Hispanic | 1.7 (1.4–2.2) | 1.1 (0.9–1.3) | 0.4 (0.3–0.6) | 0.6 (0.4–1.0d) | 0.4 (0.3–0.6) |
NOTE: ORs are adjusted for age at interview, survey year, and all other variables in the table. Survey year was significant; however, statistical significance was not found for any one type contraception.
Condoms only (reference group): Weighted n = 6,199. Females who responded with “some other (contraception) method” used at last sexual intercourse (total weighted n = 293) were removed from the analyses.
Abbreviations: DMPA = medroxyprogesterone acetate (i.e., injectable birth control), CI, confidence interval; OR, odds ratio.
Dual method = condoms plus birth control pills or DMPA.
With greater precision, the interval does not include 1.00 and is therefore significant.
With greater precision, the interval includes 1.00 and is therefore non-significant.