Table 1.
Baseline characteristics after 1:1 stratification matching in the HDP and non-HDP groups.
| HDP | non-HDP | ||
|---|---|---|---|
| Variables | (n = 4,584) | (n = 4,584) | p-value |
| Maternal characteristics | |||
| Maternal age (years) | 33.8 ± 5.0 | 33.0 ± 5.1 | |
| Category of age | 1.0 | ||
| 10’s | 22 (0.5%) | 22 (0.5%) | |
| 20’s | 883 (19.3%) | 883 (19.3%) | |
| 30’s | 3,152 (68.8%) | 3,152 (68.8%) | |
| 40’s and over | 527 (11.5%) | 527 (11.5%) | |
| Primiparous | 2,632 (57.4%) | 2,632 (57.4%) | 1.0 |
| Gestational age (weeks) | 28.8 ± 2.2 | 28.7 ± 2.1 | |
| Category of gestational weeks | 1.0 | ||
| 22–23 weeks | 84 (1.8%) | 84 (1.8%) | |
| 24–27 weeks | 1,402 (30.6%) | 1,402 (30.6%) | |
| 28–31 weeks | 3,098 (67.6%) | 3,098 (67.6%) | |
| Caesarean section | 4,406 (96.1%) | 3,332 (72.7%) | < 0.01 |
| DM or GDM | 190 (4.1%) | 133 (2.9%) | < 0.01 |
| Histological chorioamnionitis | 643 (14.0%) | 2,043 (44.6%) | < 0.01 |
| Antenatal corticosteroid | 2,460 (53.7%) | 2,747 (59.9%) | < 0.01 |
| PROM | 188 (4.1%) | 1,997 (43.6%) | < 0.01 |
| Year of delivery | 1.0 | ||
| 2003–2008 | 1,191 (26.0%) | 1,191 (26.0%) | |
| 2009–2015 | 3,393 (74.0%) | 3,393 (74.0%) | |
| Neonatal characteristics | |||
| Male | 2,124 (46.3%) | 2,467 (53.8%) | < 0.01 |
| Birth weight (g) | 913 ± 291 | 1,090 ± 280 | < 0.01 |
| Height (cm) | 34.0 ± 4.0 | 35.9 ± 3.6 | < 0.01 |
| SGA | 2,477 (54.0%) | 772 (16.8%) | < 0.01 |
Data are given as mean ± standard deviation for continuous variables and n (%) for categorical variables. HDP, hypertensive disorders of pregnancy; DM, diabetes mellitus; GDM, gestational diabetes mellitus; PROM, premature rupture of membranes; SGA, small for gestational age.