Table 2

OR and 95% confidence limits (CL) for the effect of maternal age, residence and attendance of a prenatal education course on caesarean section rate

Caesarean sectionVaginal deliveryOR95% CLP value
Maternal age, years (number, %)
 20–29 (n=130)39 (30)91 (70)2.3921.57 to 3.65<0.0001
 30–39 (n=403)204 (51)199 (49)
Maternal age, years (number, %)
 30–39 (n=403)204 (51)199 (49)0.8440.41 to 1.750.395
 ≥40 (n=31)17 (55)14 (45)
Maternal age, years (number, %)
 20–29 (n=130)39 (30)91 (70)2.8331.27 to 6.310.009
 ≥40 (n=31)17 (55)14 (45)
Residence status (number, %)
 Shanghai (n=448)219 (84)229 (75)1.7491.14 to 2.670.005
 Non-Shanghai (n=116)41 (16)75 (25)
Attendance of a prenatal education course (number, %)
 Yes (n=116)44 (38)72 (62)0.6560.43 to 0.990.029
 No (n=448)216 (48)232 (52)