Table 1.
Characteristics of study subjects and their fetuses.
| Variables | Total (n=48900) | Normal (n=37598) | APO | P | |||||
|---|---|---|---|---|---|---|---|---|---|
| All APO (n=11302) | PTB (n=2506) | LBW (n=1855) | Macrosomia (n=1797) | SGA (n=3036) | LGA (n=6182) | ||||
| Maternal age, year ( ) | 30.2 ± 4.4 | 30.1 ± 4.3 | 30.6 ± 4.5 | 30.8 ± 4.6 | 30.5 ± 4.5 | 31.1 ± 4.6 | 29.5 ± 4.2 | 31.2 ± 4.6 | <0.001 |
| Elderly parturient, n (%) | <0.001 | ||||||||
| Yes | 8304 (17.0) | 6031 (16.0) | 2273 (20.1) | 539 (21.5) | 348 (18.8) | 413 (23.0) | 368 (12.1) | 1487 (24.1) | |
| No | 40596 (83.0) | 31567 (84.0) | 9029 (79.9) | 1967 (78.5) | 1507 (81.2) | 1384 (77.0) | 2668 (87.9) | 4695 (75.9) | |
| Gravidity, n (%) | <0.001 | ||||||||
| 1 | 19724 (40.4) | 15435 (41.1) | 4289 (37.9) | 963 (38.4) | 837 (45.1) | 542 (30.2) | 1659 (54.6) | 1783 (28.8) | |
| 2 | 14981 (30.6) | 11581 (30.8) | 3400 (30.1) | 767 (30.6) | 508 (27.4) | 578 (32.2) | 771 (25.4) | 1997 (32.3) | |
| ≥3 | 14195 (29.0) | 10582 (28.1) | 3613 (32.0) | 776 (31.0) | 510 (27.5) | 677 (37.6) | 606 (20.0) | 2402 (38.9) | |
| Parity, n (%) | <0.001 | ||||||||
| 1 | 27307 (55.8) | 21276 (56.6) | 6031 (53.4) | 1405 (56.1) | 1165 (62.8) | 805 (44.8) | 2176 (71.7) | 2646 (42.8) | |
| 2 | 19945 (40.8) | 15102 (40.2) | 4843 (42.8) | 1016 (40.5) | 651 (35.1) | 899 (50.0) | 808 (26.6) | 3228 (52.2) | |
| ≥3 | 1648 (3.4) | 1220 (3.2) | 428 (3.8) | 85 (3.4) | 39 (2.1) | 93 (5.2) | 52 (1.7) | 308 (5.0) | |
| Assisted reproduction, n (%) | <0.001 | ||||||||
| Yes | 1044 (2.1) | 754 (2.1) | 290 (2.6) | 80 (3.2) | 51 (2.7) | 56 (3.1) | 57 (1.9) | 167 (2.7) | |
| No | 47856 (97.9) | 36844 (97.9) | 11012 (97.4) | 2426 (96.8) | 1804 (97.3) | 1741 (96.9) | 2979 (98.1) | 6015 (97.3) | |
| Gestational hypertension, (%) | <0.001 | ||||||||
| Yes | 964 (2.0) | 695 (1.8) | 269 (2.4) | 81 (3.2) | 72 (3.9) | 34 (1.9) | 91 (3.0) | 117 (1.9) | |
| No | 47936 (98.0) | 36903 (98.2) | 11033 (97.6) | 2425 (96.8) | 1783 (96.1) | 1763 (98.1) | 2945 (97.0) | 6065 (98.1) | |
| Gestational thyroid disorders, n (%) | 0.95 | ||||||||
| Yes | 2361 (4.8) | 1817 (4.8) | 544 (4.8) | 122 (4.9) | 97 (5.2) | 77 (4.3) | 159 (5.2) | 279 (4.5) | |
| No | 46539 (95.2) | 35781 (95.2) | 10758 (95.2) | 2384 (95.1) | 1758 (94.8) | 1720 (95.7) | 2877 (94.8) | 5903 (95.5) | |
| Delivery mode, n (%) | <0.001 | ||||||||
| Eutocia | 32225 (65.9) | 25700 (68.4) | 6525 (57.7) | 1411 (56.3) | 976 (52.6) | 834 (46.4) | 2074 (68.3) | 3256 (52.7) | |
| Cesarean | 16675 (34.1) | 11898 (31.6) | 4777 (42.3) | 1095 (43.7) | 879 (47.4) | 963 (53.6) | 962 (31.7) | 2926 (47.3) | |
| Infant sex, n (%) | 0.52 | ||||||||
| Male | 26348 (53.9) | 20228 (53.8) | 6120 (54.1) | 1453 (58.0) | 851 (45.9) | 1236 (68.8) | 1641 (54.1) | 3326 (53.8) | |
| Female | 22552 (46.1) | 17370 (46.2) | 5182 (45.9) | 1053 (42.0) | 1004 (54.1) | 561 (31.2) | 1395 (45.9) | 2856 (46.2) | |
APO, adverse pregnancy outcomes; PTB, preterm birth; LBW, low birth weight; SGA, small for gestational age; LGA, large for gestational age. P represents the comparison of the normal group (column 3) with all APO group (column 4), using either the Chi-square test or the Kruskal-Wallis rank sum test. Bold represents P values less than 0.05.