Table III.
Adjusted odds ratios for prolonged latent phase of labor by selected characteristics, with duration of latent phase at the mean, 80th, 90th, and 95th percentiles of duration of latent phase distribution, CNM database, Portland, OR, 2012-2017
| Adjusted odds of prolonged latent phase | |||||
|---|---|---|---|---|---|
| Parity | Mean (95% CI) | 80th percentile (95% CI) | 90th percentile (95% CI) | 95th percentile (95% CI) | |
| Occiput Posterior or Transverse | Nulliparous | 1.33 (0.61-2.90) | 2.14 (0.94-4.87) | 2.55 (0.95-6.87) | 3.35 (1.02-11.01) |
| Chorioamnionitis | Multiparous | 4.78 (1.46-15.62) | 17.18 (4.58-64.42) | 7.04 (2.02-24.52) | 4.57 (0.86, −24.27) |
| Late term delivery | Multiparous | 1.41 (0.91- 2.18) | 1.54 (0.90-2.62) | 2.09 (1.05-4.17) | 3.38 (1.36- 8.38) |
| Partner | Multiparous | 0.56 (0.18- 1.71) | 0.21 (0.06-0.69) | 0.41 (0.10-1.70) | 0.56 (0.06-4.89) |
Comparisons are as follows (referent category second):
Occiput Posterior or Transverse vs. Occiput Anterior, Chorioamnionitis present vs. no chorioamnionitis, Late term delivery vs. term delivery, Partnered vs. unpartnered
Models adjusted for:
partner status, maternal age, maternal height, Body Mass Index category (normal, overweight, obese), excess pregnancy weight gain, Group Beta streptococcus vaginal colonization, gestational diabetes, pre-labor rupture of membranes, gestational age at birth, birth weight, chorioamnionitis, and fetal position at birth (unless the variable was the outcome being examined)