Table 3.
Delivery complications and fetal/neonatal outcomes in women with and without oligohydramnios
| With Oligohydramnios | No Oligohydramnios | Overall | Odds Ratiob or Mean Differencec (95% CI) | |
|---|---|---|---|---|
| Delivery complications | ||||
| Obstructed labor, n/N (%) | 5/87 (5.7) | 531/12,852 (4.1) | 536/12,939 (4.1) | 0.84 (0.36, 1.93) |
| Hemorrhage, n/N (%) | 5/87 (5.7) | 212/12,666 (1.7) | 217/12,753 (1.7) | 2.94 (1.31, 6.61) |
| Hypertensive disorderd, n/N (%) | 4/87 (4.6) | 277/12,851 (2.2) | 281/12,938 (2.2) | – |
| Fetal malposition, n/N (%) | 5/87 (5.7) | 243/12,852 (1.9) | 248/12,939 (1.9) | 2.44 (1.07, 5.59) |
| C-section delivery, n/N (%) | 25/87 (28.7) | 1736/12,851 (13.5) | 1761/12,938 (13.6) | 2.07 (1.41, 3.03) |
| Maternal death < 42 daysd, n/N (rate/100,000 deliveries) | 0/87 (0) | 12/12,800 (94) | 12/12,887 (93) | – |
| Maternal sepsis, n/N (%) | 1/87 (1.1) | 134/12,720 (1.1) | 135/12,807 (1.1) | 0.82 (0.19, 3.57) |
| Fetal/Neonatal outcomesa | ||||
| Stillbirth, n/N (rate/1000) | 7/87 (80.5) | 192/12,852 (14.9) | 199/12,939 (15.4) | 5.16 (2.07, 12.85) |
| Male, n/N (%) | 43/86 (50.0) | 6578/12,849 (51.2) | 6621/12,935 (51.2) | 0.99 (0.69, 1.41) |
| Low birth weight, n/N (%) | 26/87 (29.9) | 1507/12,849 (11.7) | 1533/12,936 (11.9) | 2.10 (1.44, 3.07) |
| Multiple gestation, n/N (%) | 2/87 (2.3) | 76/12,851 (0.6) | 78/12,938 (0.6) | 1.93 (0.26, 14.37) |
| Congenital anomalyd, n/N (%) | 2/77 (2.6) | 18/12,513 (0.1) | 20/12,590 (0.2) | – |
| Birth weight, Mean (sd) | 2710 (595) | 2971 (441) | 2969 (443) | −162.3 (−288.6, −35.9) |
| GA at delivery, Mean (sd) | 37.7 (2.9) | 38.6 (2.0) | 38.6 (2.0) | −0.53 (−1.07, 0.00) |
| Preterm Birth, n/N (%) | 27/85 (31.8) | 1438/12,566 (11.4) | 1465/12,651 (11.6) | 2.73 (1.76, 4.23) |
| Neonatal death < 28 days, n/N (rate/1000) | 6/80 (75.0) | 211/12,613 (16.7) | 217/12,693 (17.1) | 3.18 (1.18, 8.57) |
aFetal/Neonatal outcomes are calculated at the maternal level if at least one fetus/neonate has the outcome
bOdds ratios from a multivariable logistic regression model adjusting for at least one oligohydramnios finding, previous
live birth and site using general estimating equations to account for the correlation of outcomes within cluster
cMean difference from a multivariable regression model adjusting for at least one oligohydramnios finding and site, previous live birth and site using general estimating equations to account for the correlation of outcomes within cluster
dModel did not converge