Prediction of pregnancy with logistic regression. Analysis was limited to those who participated in all 3 waves of the survey (n=560). Did not report sex past 60 days are those who participated in the wave but did not answer the question how many times they had sex in the past 60 days. Condom use in the past 60 days was imputed from condom use in the past 14 days for these individuals. Predictors of pregnancy are measured in the wave previous to pregnancy
| Variable | OR (95% CI) | p |
| Pregnancy at wave 2 | ||
| Suspected over–report | 3.95 (1.63 to 9.58) | 0.002 |
| Times sex past 60 days | 1.02 (1.00 to 1.05) | 0.02 |
| Proportion condom use past 60 days | 0.50 (0.21 to 1.18) | 0.11 |
| Birth control pill | 0.42 (0.12 to 1.40) | 0.16 |
| Did not report sex past 60 days | 0.57 (0.15 to 2.17) | 0.41 |
| Pregnancy at wave 3 | ||
| Suspected over–report | 2.64 (0.92 to 7.58) | 0.07 |
| Times sex past 60 days | 1.04 (1.02 to 1.06) | 0.000 |
| Proportion condom use past 60 days | 0.56 (0.24 to 1.31) | 0.18 |
| Birth control pill | 0.14 (0.02 to 1.08) | 0.06 |
| Did not report sex past 60 days | 1.52 (0.57 to 4.01) | 0.40 |