Table 4.

Cox regression results by gender of first child

Variable	First child - Girl	First child - Boy
	Coefficient (SE)	Coefficient (SE)
Fertility intention
Intended number of children	0.710***	0.557***
	(0.165)	(0.150)
Presence of son preference (reference category: No)
Yes	−0.079	−0.294*
	(0.121)	(0.140)
Individual characteristics
Age	−0.027	−0.510***
	(0.137)	(0.151)
Age squared	0.004*	0.009***
	(0.002)	(0.002)
Age at first childbirth	−0.155***	−0.238***
	(0.025)	(0.032)
Year of first childbirth (reference category: 2000 and after)
1980s and 1990s	−0.785***	−0.683**
	(0.183)	(0.258)
Hukou (reference category: non-rural type)
Rural type	0.852***	0.807***
	(0.160)	(0.199)
Education (reference category: elementary school and below)
Middle school	0.034	−0.217
	(0.244)	(0.178)
High school/technical secondary school	0.022	−0.692*
	(0.276)	(0.275)
Junior college	−2.125***	−1.649**
	(0.573)	(0.504)
College and above	−2.846**	−31.21
	(1.038)	(1.845e+06)
Existing childbirth status
Prior abortion (reference category: No)
Yes	−1.198***	−0.751*
	(0.324)	(0.288)
Family environment
Number of paternal siblings	0.086*	0.069
	(0.039)	(0.047)
Presence of parents-in-law (reference category: No)
Yes	6.090**	1.097
	(2.065)	(1.545)
Presence of parents-in-law * Age	−0.150**	−0.021
	(0.051)	(0.038)
Regional factor
Region (reference category: Central Shaanxi)
Southern Shaanxi	−0.089	−0.296+
	(0.123)	(0.173)
Northern Shaanxi	0.592***	0.914***
	(0.146)	(0.169)
Sample size	1,019	1,082
−2LL	432.03***	453.60***

^***p<0.001;

^**p<0.01;

^*p<0.05;

+p<0.1