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

Table 3 The association between migrant status and CS rates

The adjusted variables	CSMR vs vaginal birth			MICS vs vaginal birth
The adjusted variables	Residents	Migrants RR (95%CI)	p	Residents	Migrants RR (95%CI)	p
All subjects (n = 40,621)
Crude ^a	Ref	0.664 (0.627,0.704)	< 0.001	Ref	0.776 (0.739,0.815)	< 0.001
Adjusted for maternal age at delivery	Ref	0.774 (0.747,0.802)	0.002	Ref	0.824 (0.783,0.867)	< 0.001
Adjusted for ethnicity	Ref	0.753 (0.725,0.779)	< 0.001	Ref	0.774 (0.737,0.813)	< 0.001
Adjusted for health insurance	Ref	0.755 (0.727,0.785)	< 0.001	Ref	0.706 (0.671,0.743)	0.001
Adjusted for occupation	Ref	0.747 (0.726,0.780)	0.004	Ref	0.773 (0.736,0.812)	0.003
Adjusted for adverse health conditions ^b	Ref	0.668 (0.631,0.708)	0.001	Ref	0.787 (0.749,0.827)	< 0.001
Adjusted for all above variables	Ref	0.697 (0.657,0.740)	0.002	Ref	0.770 (0.731,0.812)	< 0.001
Subjects of Group 1 based on Robson Classification(n = 13,616)
Crude ^a	Ref	0.742 (0.605,0.910)	0.004	Ref	0.885 (0.699,1.120)	0.308
Adjusted for maternal age at delivery	Ref	0.769 (0.626,0.945)	0.012	Ref	0.873 (0.690,1.105)	0.259
Adjusted for ethics	Ref	0.735 (0.598,0.902)	0.003	Ref	0.886 (0.700,1.123)	0.318
Adjusted for health insurance	Ref	0.730 (0.594,0.896)	0.003	Ref	0.878 (0.693,1.112)	0.281
Adjusted for occupation	Ref	0.737 (0.601,0.905)	0.004	Ref	0.877 (0.693,1.110)	0.275
Adjusted for adverse health conditions ^b	Ref	0.744 (0.607,0.914)	0.024	Ref	0.718 (0.564,0.913)	0.043
Adjusted for all above variables	Ref	0.728 (0.580,0,915)	0.009	Ref	0.767 (0.602,0.978)	0.024

^a Not adjusted for any variables
^b Having one or more adverse health conditions (these conditions were not (or not severe enough to be) absolute contraindications to vaginal delivery)

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