(1)	(2)
Outcome variables: Twin-birth indicator	Bivariate regressions	Multivariate regression
Moedu	0.000	-0.001
	(0.001)	(0.002)
Faedu	0.001	0.001
	(0.001)	(0.001)
Moage	-0.000	-0.001
	(0.001)	(0.001)
Moage1b	-0.000	0.002
	(0.001)	(0.003)
Faage	-0.001	0.000
	(0.001)	(0.003)
PCland	-0.001	-0.001
	(0.005)	(0.005)
Log(PCasset)	-0.004	-0.001
	(0.138)	(0.003)
N	1,495	1,495
R2		0.002