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Table 3 Characteristics of the study populations

From: A descriptive analysis of the indications for caesarean section in mainland China

   All Vaginal delivery Overall rate of CS, n (%) Caesarean section P
Spontaneous, n (%) Operative, n (%) With medical indication, n (%) Without medical indication n (%)
Maternal age, years ≤24 23403 12005 (51.30) 142 (0.61) 11256 (48.10) 7011 (29.96) 4245 (18.14) <0.001
25–29 43661 20118 (46.08) 580 (1.33) 22663 (51.91) 16135 (36.96) 6528 (14.95)
30–34 25155 9992 (39.72) 387 (1.54) 14776 (58.74) 11072 (44.02) 3704 (14.72)
≥35 9729 2856 (29.36) 7 (0.76) 6799 (69.88) 5541 (56.95) 1258 (12.93)
Pre-labour BMI <18.5 107 62 (57.94) 4 (3.74) 41 (38.32) 12 (11.21) 29 (27.10) <0.001
18.5–24.9 25059 13507 (53.9) 319 (1.27) 11233 (44.83) 3178 (12.68) 8055 (32.14)
25–29.9 50802 22775 (44.83) 676 (1.33) 27347 (53.83) 7026 (13.83) 20321 (40)
≥30 15991 5045 (31.55) 146 (0.91) 10799 (67.53) 2174 (13.60) 8625 (53.94)
Previous births, n 0 91208 39677 (43.50) 1242 (1.36) 50282 (55.13) 35306 (38.71) 14976 (16.42) <0.001
1 19077 9038 (47.38) 89 (0.47) 9950 (52.16) 8418 (44.13) 1532 (8.03)
≥2 2140 1025 (47.90) 10 (0.47) 1105 (51.64) 957 (44.72) 148 (6.92)
Sex of child Male 55620 23830 (42.84) 706 (1.27) 31084 (55.89) 22349 (40.18) 8735 (15.70) <0.001
Female 46804 21441 (45.81) 482 (1.03) 24881 (53.16) 17706 (37.83) 7175 (15.33)
  1. BMI, body mass index (mother’s).