Table 1.
General and obstetric characteristics of women of the retrospective cohort according to the position of fetal head at the first stage of labor
| Characteristics | Overall (N=1500) | OPP (N=524) | OAP (N=976) | p | |||
|---|---|---|---|---|---|---|---|
| General | |||||||
| Mean | SD | Mean | SD | Mean | SD | ||
| Maternal age (years) | 32.1 | 5.2 | 32.4 | 5.3 | 31.9 | 5.2 | 0.076 |
| BMI pre-conception | 22.5 | 3.8 | 22.5 | 3.8 | 22.5 | 3.9 | 0.879 |
| Gestational weight gain | 12.8 | 4.6 | 13.0 | 4.6 | 12.6 | 4.5 | 0.153 |
| n | % | n | % | n | % | ||
| Maternal age ≥35 years | 502 | 33.5 | 194 | 37.0 | 308 | 31.6 | 0.032 |
| BMI >30 | 235 | 15.7 | 85 | 16.2 | 150 | 15.4 | 0.665 |
| Ethnicity (Caucasian) | 1236 | 82.4 | 448 | 85.5 | 788 | 80.7 | 0.021 |
| Obstetric | |||||||
| Nulliparous | 839 | 55.9 | 296 | 56.5 | 543 | 55.6 | 0.751 |
| Previous CS | 142 | 9.5 | 45 | 8.6 | 97 | 9.9 | 0.394 |
| Uncomplicated pregnancy | 1196 | 79.73 | 423 | 80.7 | 773 | 79.2 | 0.484 |
| Mean | SD | Mean | SD | Mean | SD | ||
| Gestational age (weeks) | 39.7 | 1.2 | 39.75 | 1.18 | 39.68 | 1.22 | 0.299 |
| n | % | n | % | n | % | ||
| Gestational age >40 weeks | 429 | 28.6 | 152 | 29.0 | 277 | 28.4 | 0.798 |
| PROM | 643 | 42.9 | 218 | 41.6 | 425 | 43.6 | 0.469 |
| Spontaneous onset of labor | 1076 | 71.7 | 381 | 72.7 | 695 | 71.2 | 0.538 |
OPP: occiput posterior position. OAP: occiput anterior position. CS: cesarean section. PROM: premature rupture of membranes. Uncomplicated pregnancy is defined as a pregnancy in a woman with no chronic conditions or gestational complications. BMI: body mass index (kg/m2).