Number of HRPB Signs or symptoms | Outcome – Reference Standard (N) | Probability of Delivering Preterm | Likelihood Ratio (95% Confidence Interval) | Odds Ratio from GEE Model (95% Confidence Interval) a | |
---|---|---|---|---|---|
Preterm | Term | ||||
0 | 353 | 5965 | 0.06 | 0.55 (0.50–0.60) | Reference |
1 | 173 | 273 | 0.39 | 5.89 (4.44–7.81) | 10.3 (8.14–13.0) |
2 | 139 | 116 | 0.55 | 11.05 (7.51–16.27) | 19.4 (14.6–25.8) |
3 or more | 21 | 10 | 0.68 | 19.51 (0.84–454.0) | 37.7 (17.4–81.9) |
Total | 686 | 6364 |