Likelihood ratios of historical variables for being pregnant
| Positive HCG | LR+ | 95% CI | |
|---|---|---|---|
| CI, confidence interval; HCG, human chorionotropic gonadotropin; LMP, last menstrual period; LR+, positive likelihood ratio. | |||
| Yes to “might be” (n = 30) | 6 | 10.53 | 5.51 to 20.47 |
| Yes to “chance pregnant” (n = 137) | 10 | 3.23 | 2.59 to 4.17 |
| LMP not on time (n = 113) | 7 | 2.36 | 1.36 to 4.11 |
| LMP not normal (n = 125) | 5 | 1.75 | 0.91 to 3.39 |
| No birth control (n = 242) | 8 | 1.71 | 1.19 to 2.48 |
| Sexually active (n = 344) | 11 | 1.37 | 1.30 to 1.45 |