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Table 1 The CS rates of Robson Classification by residents and migrants (n = 40,621)

From: Association between migration status and caesarean section delivery based on a modified Robson classification in China

  Residents(n = 27,169) Migrants(n = 13,452) p a p b, c
CS rate % Rate of CSMR% Rate of MICS% CS rate % Rate of CSMR % Rate of MICS %   
Modified Robson Ten-group Classification System
 1 Nulliparous women with a single cephalic pregnancy, at ≥37 weeks of gestation in spontaneous labour 6.2 (558/8941) 3.1 (279/8941) 3.1 (279/8941) 5.0 (236/4675) 2.4 (112/4675) 2.7 (124/4675) 0.005 0.015
 2 Nulliparous women with a single cephalic pregnancy, at ≥37 weeks of gestation, who had labour induced 19.5 (878/4501) 11.2 (504/4501) 8.3 (374/4501) 20.8 (548/2630) 11.1 (291/2630) 9.8 (257/2630) 0.176 0.110
 3 Multiparous women, without a uterine scar, with a single cephalic pregnancy at ≥37 weeks of gestation in spontaneous labour 5.1 (61/1199) 1.4 (17/1199) 3.7 (44/1199) 4.6 (43/939) 1.6 (15/939) 3.0 (28/939) 0.588 0.648
 4 Multiparous women, without a uterine scar, with a single cephalic pregnancy at ≥37 weeks of gestation, who had labour induced 7.4 (26/350) 2.3 (8/350) 5.1 (18/350) 8.6 (24/278) 1.4 (4/278) 7.2 (20/278) 0.580 0.431
 5 Multiparous women, with at least one previous uterine scar with a single cephalic pregnancy at ≥37 weeks of gestation 98.2 (387/394) 0 (0/394) 98.2 (387/394) 96.8 (240/248) 0 (0/248) 96.8 (240/248) 0.237 0.286
 6 All women with a single non-cephalic pregnancy, with previous CS 98.7 (1169/1184) 0 (0/1184) 98.7 (1169/1184) 98.6 (562/570) 0 (0/570) 98.6 (562/570) 0.814 0.825
 7 Nulliparous women with a single cephalic pregnancy, at ≥37 weeks of gestation, who had caesarean section before labourd 100.0 (7419/7419) 51.3 (3803/7419) 48.7 (3616/48.9) 100.0 (2373/2373) 49.6 (1176/2373) 50.4 (1197/2372) 0.150
 8 Multiparous women, without a uterine scar, with a single cephalic pregnancy at ≥37 weeks of gestation, who had caesarean section before labour d 100.0 (1295/1295) 31.4 (407/1295) 68.6 (888/1295) 100.0 (716/716) 30.2 (216/716) 69.8 (500/716) 0.580
 9 All women with multiple pregnancies including women with a uterine scar 95.9 (662/690) 31.2 (215/690) 64.8 (447/690) 93.7 (388/414) 33.8 (140/414) 59.9 (248/414) 0.097 0.125
 10 All women with a single cephalic pregnancy at < 37 weeks gestation, including women with previous CS 41.6 (498/1196) 17.4 (208/1196) 24.2 (290/1196) 39.4 (240/609) 16.6 (101/609) 22.8 (139/607) 0.384 0.658
  1. a The comparison of CS rate b between resident and migrant women using Chi-square analysis
  2. b The comparison of the ratios of CSMR, MICS and vaginal birth between resident and migrant women using Chi-square analysis in group1 ~ 6 and 9 ~ 10
  3. c The comparison of the ratios of CSMR and MICS between resident and migrant women using Chi-square analysis in group 7 and group 8
  4. d The group is defined as 100% CS rate according to the modified Robson Classification