Table 1.
Main maternal and fetal characteristics of the studied population in relation to the newborn umbilical artery blood pH (pH > 7.20, nonacidemia; pH ≤ 7.20, acidemia).
| Total N = 63 (%) |
Acidemia N = 16 (%) |
Nonacidemia N = 47 (%) |
P value | |
|---|---|---|---|---|
| Maternal age, y (mean ± SD) | 30.08 ± 2.89 | 30.81 ± 2.34 | 29.83 ± 3.04 | 0.93 |
| Maternal age ≥ 35 y∗∗ | 5 (7.9) | 1 (6.3) | 4 (8.5) | 1.00 |
| Gestational age at delivery, wk (median, range) | 39.00 (37, 41) | 39.00 (38, 41) | 40.00 (37, 41) | 0.77 |
| BMI (median, range) | 20.60 (15.8, 33.2) | 20.70 (16.5, 31.7) | 20.60 (15.8, 33.2) | 0.91 |
| BMI ≥ 30∗∗ | 4 (6.3) | 2 (12.5) | 2 (4.3) | 0.57 |
| Smoking∗∗ | 4 (6.3) | 1 (6.3) | 3 (6.4) | 1.00 |
| Any gestational hypertension or preeclampsia∗∗ | 6 (9.5) | 2 (12.5) | 4 (8.5) | 1.00 |
| Gestational DM∗∗ | 15 (23.8) | 5 (31.3) | 10 (21.3) | 0.64 |
| Premature rupture of membrane∗ | 20 (31.7) | 4 (25.0) | 16 (34.0) | 0.50 |
| Nulliparous∗ | 61 (96.8) | 16 (100) | 45 (95.7) | 0.40 |
| Prior C-section∗∗ | 0 | 0 | 0 | - |
| Prior vaginal delivery# | 2 (3.2) | 0 (0) | 2 (4.3) | 0.55 |
| Labor type | ||||
| Spontaneous∗ | 55 (87.3) | 13 (81.2) | 42 (89.4) | 0.40 |
| Induced∗∗ | 12 (19.0) | 4 (25.0) | 8 (17.0) | 0.74 |
| Prostaglandin∗∗ | 10 (15.9) | 3 (18.8) | 7 (14.9) | 1.00 |
| Birth weight, g (mean ± SD) | 3498.17 ± 452.00 | 3598.13 ± 414.75 | 3464.15 ± 463.27 | 0.72 |
| Birth weight > 4000 g∗∗ | 9 (14.3) | 3 (18.8) | 6 (12.8) | 0.86 |
| Birth weight < 2500 g | 0 | 0 | 0 | - |
| Mode of delivery | ||||
| Vaginal∗ | 55 (87.3) | 13 (81.3) | 42 (89.4) | 0.40 |
| Operative vaginal∗∗ | 6 (9.5) | 3 (18.8) | 3 (6.4) | 0.34 |
| Cesarean∗∗ | 8 (12.7) | 3 (18.7) | 5 (10.6) | 0.68 |
| Labor time, min (median, range) | 495.00 (43, 1295) | 491.00 (212, 1029) | 495.00 (43, 1295) | 0.31 |
| Asphyxia (Apgar ≤ 7) | 0 | 0 | 0 | - |
| Arterial pH (median, range) | 7.24 (6.98, 7.38) | 7.16 (6.98, 7.19) | 7.25 (7.21, 7.38) | <0.01 |
| NICU admission∗∗ | 4 (6.3) | 3 (18.8) | 1 (2.1) | 0.02 |
BMI: body mass index; DM: diabetes mellitus; NICU: neonatal intensive care unit. ∗Pearson's chi-square test. ∗∗Continuity correction. #Fisher's exact test.