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Table 1 Distribution of maternal traits and pregnancy complications by maternal age groups (N = 22,950)

From: The trend in delayed childbearing and its potential consequences on pregnancy outcomes: a single center 9-years retrospective cohort study in Hubei, China

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
  1. * = Frequency and percentage of variables with only ‘Yes’ value presented, HDP Hypertensive disorders of pregnancy, GH Gestational hypertension, PE Preeclampsia, PROM Premature rupture of membrane, GDM Gestational diabetes mellitus, p-values were calculated using chi-square test