The relationship between internal migration and the likelihood of high-risk pregnancy: Hukou system and high-risk pregnancies in China

Table 1 Summary statistics on the characteristics of the study population (Shanghai-native vs. Internal migrants)

Variable	All (N = 133,358)		Shanghai-native (N = 83,872)		Internal migrants (N = 49,486)
Variable	Mean	S.D	Mean	S.D	Mean	S.D
High-risk pregnancy	0.537	0.499	0.523	0.499	0.561	0.496
Age	30.69	3.911	31.01	3.864	30.16	3.933
Age square	957.4	247.2	976.5	247.2	925.2	243.7
Ethnic group	0.986	0.116	0.992	0.0911	0.978	0.148
Nationality	0.998	0.0488	0.999	0.036	0.996	0.0649
Occupation	0.938	0.241	0.964	0.186	0.894	0.308
Marriage status	0.998	0.0439	0.999	0.036	0.997	0.0548
Insurance status	0.615	0.487	0.678	0.467	0.508	0.5
Gravida	1.81	1.079	1.725	1.006	1.955	1.179
Parity	1.25	0.455	1.225	0.427	1.293	0.497
Severe pregnant	0.00112	0.0334	0.000942	0.0307	0.00141	0.0376
Cesarean delivery	0.407	0.491	0.425	0.494	0.377	0.485

ISSN: 1471-2393