Table 1 Distribution of maternal traits and pregnancy complications by maternal age groups (N = 22,950)
Maternal traits, and pregnancy complications | Groups of maternal age | |||
|---|---|---|---|---|
G1 (n = 11,282) < 30 years No. % | G2 (n = 7732) 30–34 years No. % | G3 (n = 3936) ≥35 years No. % | P-value | |
Maternal education | ||||
 Low | 2458 (21.8) | 1494 (19.3) | 965 (24.6) | 0.001 |
 Middle | 4575 (40.6) | 2947 (38.1) | 1517 (38.5) |  |
 Higher | 4249 (37.6) | 3291 (42.6) | 1454 (36.9) |  |
Maternal occupation | ||||
 Housewives | 6046 (53.6) | 3810 (49.3) | 2135 (54.3) | 0.001 |
 Professional services | 4964 (44) | 3751 (48.5) | 1702 (43.2) |  |
 Manual workers | 272 (2.4) | 171 (2.2) | 99 (2.5) |  |
Parity | ||||
 Primiparous (≤1) | 9494 (84.2) | 5606 (72.5) | 2302 (58.5) | 0.001 |
 Multiparous (> 1) | 1788 (15.8) | 2126 (27.5) | 1634 (41.5) |  |
 Cesarean section* | 5993 (53.1) | 5032 (65.1) | 2905 (73.8) | 0.001 |
 Previous history of cesarean section * | 991 (8.8) | 1484 (19.2) | 1103 (28.0) | 0.001 |
HDP | ||||
 GH* | 119 (1.1) | 96 (1.2) | 64 (1.6) | 0.02 |
 PE* | 451 (4.0) | 398 (5.1) | 261 (6.6) | 0.001 |
 Sever PE* | 63 (0.6) | 36 (0.5) | 34 (0.9) | 0.02 |
Abnormal Placentation | ||||
 Placenta previa* | 384 (3.4) | 331 (4.3) | 247 (6.3) | 0.001 |
 Placental abruption* | 24 (0.2) | 16 (0.2) | 12 (0.3) | 0.5 |
Others pregnancy complications | ||||
 PROM* | 1126 (10.0) | 681 (8.8) | 339 (8.6) | 0.005 |
 GDM* | 517 (4.6) | 587 (7.6) | 429 (10.9) | 0.001 |
 Fetal breech presentation* | 267 (2.4) | 195 (2.5) | 109 (2.8) | 0.3 |
 Oligohydramnios* | 411 (3.6) | 281 (3.6) | 108 (2.7) | 0.02 |
 Polyhydramnios* | 51 (0.5) | 28 (0.4) | 11 (0.3) | 0.3 |
 Nuchal cord* | 533 (4.7) | 309 (4.0) | 150 (3.8) | 0.01 |