|
Low volume (n=70,849) |
High volume (n=70,006) |
p
value |
Maternal age |
28.8±5.6 |
28.6±5.6 |
<0.01 |
Gravidity |
4±2.8 |
3.9±2.8 |
<0.01 |
Parity |
3.5±2.4 |
3.5±2.4 |
<0.01 |
Previous miscarriages |
20409 (28.8%) |
19847 (28.4%) |
0.06 |
Previous miscarriages>3 |
2453 (3.5%) |
2476 (3.5%) |
0.45 |
Previous cesarean delivery any |
5320 (7.5%) |
5051 (7.2%) |
0.03 |
Assisted reproductive techniques |
1444 (2%) |
1512 (2.2%) |
0.11 |
Hypertensive disorders of pregnancy |
1269 (1.8%) |
1306
(1.9%) |
0.30 |
Diabetes (pre-gestational + gestational) |
2709 (3.8%) |
2517
(3.6%) |
0.02 |
Gestational age at delivery weeks |
39.5±1.2 |
39.5±1.2 |
0.01 |
Meconium-stained amniotic fluid |
11571 (16.3%) |
11300
(16.1%) |
0.33 |
Epidural analgesia |
39038 (55.1%) |
38433 (54.9%) |
0.45 |
Chorioamnionitis |
138 (0.2%) |
164 (0.2%) |
0.11 |
Persistent occiput posterior |
2227 (3.1%) |
2363 (3.4%) |
0.01 |
Induction of labor |
6151 (8.7%) |
6059 (8.7%) |
0.86 |
Oxytocin augmentation of labor |
13719 (19.4%) |
13867
(19.8%) |
0.04 |
Birthweight grams |
3336.5±423.7 |
3338.5±423 |
0.37 |
Birthweight>4000 grams |
4440 (6.3%) |
4393 (6.3%) |
0.95 |
Large for gestational age |
10259 (14.5%) |
10102 (14.4%) |
0.79 |
Small for gestational age |
4268 (6%) |
4289 (6.1%) |
0.42 |
Second stage duration, hours |
0:32:40±1:12:28 |
0:33:30±1:18:13 |
0.04 |
Prolonged second stage |
2592 (3.7%) |
2573 (3.7%) |
0.87 |
Data are mean± standard deviation; number (%); |
Data are mean±
standard deviation; number (%); |
Data are mean± standard deviation;
number (%); |
Data are mean± standard deviation; number
(%); |