Table 1 Demographic and clinical characteristics of women admitted to a tertiary hospital at 24–34 weeks gestation
From: Timing of delivery in a high-risk obstetric population: a clinical prediction model
Delivery within 7 days (N = 1473) | Delivery in >7 days (N = 1539) | p valuea | |
|---|---|---|---|
Baseline Demographic and Medical/Surgical History | |||
Maternal age on admission (years)a | |||
< 20 | 74 (5.0%) | 45 (2.9%) | |
20–24 | 219 (14.9%) | 213 (13.8%) | |
25–29 | 403 (27.4%) | 404 (26.3%) | |
30–34 | 466 (31.6%) | 509 (33.1%) | 0.002 |
35–39 | 260 (17.7%) | 275 (17.9%) | |
40–44 | 43 (2.9%) | 79 (5.1%) | |
≥ 45 | 8 (0.5%) | 14 (0.9%) | |
Nulliparousa | 811 (55.1%) | 699 (45.4%) | <0.001 |
Prior miscarriagea | 432 (29.3%) | 514 (33.4%) | 0.018 |
Prior therapeutic abortion | 227 (15.4%) | 231 (15.0%) | 0.798 |
Prior birth at <37 weeks | 213 (14.5%) | 321 (20.9%) | 0.013 |
Prior birth at 34–36 weeksa | 82 (5.6%) | 131 (8.5%) | 0.090 |
Prior birth at <34 weeksa | 161 (10.9%) | 190 (12.3%) | 0.476 |
Pre-existing medical conditions | |||
Pre-existing hypertensiona | 26 (1.8%) | 48 (3.1%) | 0.023 |
Pre-existing diabetes mellitus | 20 (1.4%) | 24 (1.6%) | 0.757 |
Uterine structural abnormalitiesa,c | 73 (5.0%) | 94 (6.1%) | 0.193 |
Renal disease/urologya | 7 (0.5%) | 20 (1.3%) | 0.027 |
Rheumatic disease | 14 (1.0%) | 8 (0.5%) | 0.241 |
Cardiac disease | 10 (0.7%) | 14 (0.9%) | 0.612 |
Cervical procedures | 17 (1.2%) | 21 (1.4%) | 0.723 |
Otherb | 202 (13.7%) | 261 (17.0%) | 0.016 |
Smoking after pregnancy diagnoseda | 321 (21.8%) | 265 (17.2%) | 0.002 |
Missing | 18 (1.2%) | 5 (0.3%) | |
Alcohol use during pregnancy (socially or at least twice weekly)a | 43 (2.9%) | 42 (2.7%) | 0.838 |
Missing | 19 (1.3%) | 11 (0.7%) | |
Illicit drug use after pregnancy diagnoseda | 69 (4.7%) | 52 (3.4%) | 0.083 |
Missing | 19 (1.3%) | 7 (0.5%) | |
Current pregnancy | |||
GA on admissiona (weeks) | |||
24 + 0–25 + 6 | 520 (35.3%) | 602 (39.1%) | |
26 + 0–27 + 6 | 593 (40.3%) | 616 (40.0%) | |
28 + 0–29 + 6 | 329 (22.3%) | 311 (20.2%) | <0.001 |
30 + 0–31 + 6 | 10 (0.7%) | 7 (0.5%) | |
32 + 0–34 + 6 | 21 (1.4%) | 3 (0.2%) | |
Multiple pregnancya | 256 (17.4%) | 380 (24.7%) | <0.001 |
Twins | 237 (16.1%) | 343 (22.3%) | |
Triplets | 19 (1.3%) | 37 (2.4%) | |
Reasons for admission | |||
Preterm laboura | 776 (52.7%) | 489 (31.8%) | <0.001 |
Preterm pre-labour rupture of membranesa | 597 (40.5%) | 483 (31.4%) | <0.001 |
Short cervix without contractionsa | 125 (8.5%) | 548 (35.6%) | <0.001 |
Dilated cervix or prolapsed membranes without contractionsa | 241 (16.4%) | 154 (10.0%) | <0.001 |
Other associated complications/conditions at admission | |||
Antepartum haemorrhagea | 219 (14.9%) | 123 (8.0%) | <0.001 |
Gestational hypertension (any) | 9 (0.6%) | 4 (0.3%) | 0.170 |
Gestational hypertension with proteinuria | 7 (0.5%) | 3 (0.2%) | 0.217 |
Intrauterine fetal growth restriction | 18 (1.2%) | 25 (1.6%) | 0.604 |