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Table 2 Characteristics of study populations

From: Caesarean deliveries in China

Variable All (n = 112138) n (%) Tertiary hospital (n = 79631) n (%) Secondary hospital (n = 32507) n (%) X 2 p
Maternal age (years)     <0.001
 (Years) 29 (26–31) 26 (23–30)   
   ≤ 24 25734 (23.1) 12950 (16.4) 12784 (39.7)   
  25–34 74355 (66.8) 57536 (72.8) 16819 (52.2)   
   ≥ 35 11197 (10.1) 8583 (10.9) 2614 (8.1)   
Maternal education level     <0.001
 College or above 55473 (51.3) 46093 (59.0) 9380 (31.3)   
 High school 29935 (27.7) 20411 (26.1) 9524 (31.8)   
 Primary school 22468 (20.8) 11442 (14.6) 11026 (36.8)   
 Illiteracy 258 (0.2) 214 (0.3) 44 (0.1)   
Residents 77661 (69.3) 56595 (71.1) 21066 (64.8) 425.80 <0.001
Obesity 15980 (17.4) 12512 (19.0) 3468 (13.2) 1584.92 <0.001
Primiparous 90971 (81.1) 66827 (83.9) 24144 (74.3) 1403.10 <0.001
Previous bad obstetric history 1084 (1.0) 952 (1.2) 132 (0.4) 150.28 <0.001
Male infants 61345 (54.7) 43028 (54.3) 18137 (55.8) 28.84 <0.001
Multiple fetus 1918 (1.7) 1771 (2.2) 147 (0.5) 431.05 <0.001
GDM/DM 5344 (4.8) 5024 (6.3) 320 (1.0) 1442.08 <0.001
HDCP 5357 (4.8) 4594 (5.8) 763 (2.3) 594.21 <0.001
Preeclampsia/eclampsia 4137 (3.7) 3650 (4.6) 487 (1.5) 618.52 <0.001
PROM 17078 (15.2) 13965 (17.5) 3113 (9.6) 1133.14 <0.001
Preterm birth 9014 (8.0) 8156 (10.2) 858 (2.6) 1805.02 <0.001
Late pregnancy bleeding 2364 (2.1) 2127 (2.7) 237 (0.7) 421.85 <0.001
oligohydrammios 4200 (3.7) 2938 (3.7) 1262 (1.6) 2.37 0.12
Fetus weight ≥ 4000 g 7366 (6.7) 5075 (6.5) 2291 (7.1) 14.38 <0.001
  1. Quantitative variables of age are expressed as median (25th percentile–75th percentile)
  2. 852 missing cases for maternal age; 4004 missing cases for maternal education, 20187 missing cases for maternal BMI;, 2071 missing cases for neonatal weight
  3. IVF-ET In Vitro Fertilization Pre-Embryo Transfer, PROM Preterm Rupture Of Membranes, HDCP Hypertension Disorder Complicating Pregnancy