Table 2.

Results of the binomial regression model for associated factors of induced abortion

	M1		M2
	AOR	SE	AOR	SE
Cohort (ref. = 15–24)
25–34	6.813***	0.260	28.805***	3.619
35–44	11.729***	0.443	52.510***	6.516
45–54	10.899***	0.416	60.698***	7.504
55–60	9.924***	0.404	59.362***	7.539
Residence (ref. = Urban)
Rural	0.687***	0.008	0.866	0.077
Cohort* Residence
25–34* Rural			0.975	0.091
35–44* Rural			0.874	0.081
45–54* Rural			0.707***	0.065
55–60* Rural			0.619***	0.060
Ethnic group (ref.=Han)
Minority	0.993	0.017	1.209	0.125
Cohort* Ethnic group
25–34* Minority			0.903	0.099
35–44* Minority			0.771*	0.083
45–54* Minority			0.758*	0.082
55–60* Minority			0.826	0.099
Education (ref. = Junior middle school or below)
High school	1.217***	0.018	0.927	0.087
College or above	0.972	0.017	0.616***	0.086
Cohort*Education
25–34* High school			1.091	0.107
35–44* High school			1.319**	0.129
45–54* High school			1.393**	0.135
55–60* High school			1.502***	0.152
25–34* College or above			1.062	0.151
35–44* College or above			1.993***	0.282
45–54* College or above			2.586***	0.369
55–60* College or above			2.378***	0.387
Premarital pregnancy or not (ref.=No premarital pregnancy)
Premarital pregnancy	2.115***	0.023	45.612***	4.904
Cohort* Premarital pregnancy or not
25–34* Premarital pregnancy			0.066***	0.007
35–44* Premarital pregnancy			0.047***	0.005
45–54* Premarital pregnancy			0.035***	0.004
55–60* Premarital pregnancy			0.033***	0.004
Constant	0.027***	0.001	0.006***	0.001

AOR adjusted odds ratio, SE standard error; ***p < .001; **p < .01; *p < .05; Confounders include health status, employment status, and number of siblings for the women are omitted in the table