Table 4:

OLS regression models of number of unique support sources on childless status (N=14,575)

	2005	2011
		(main equation)	(selection equation)
Childless	−1.07***	−0.46*	−0.17
	(0.13)	(0.23)	(0.25)
Age	0.00	−0.01	−0.04***
	(0.00)	(0.01)	(0.00)
Female	0.07*	−0.04	−0.01
	(0.03)	(0.05)	(0.04)
Years of education	0.00	−0.02*	−0.02**
	(0.00)	(0.01)	(0.01)
Martial status (ref: widowed)
Married	0.23***	0.09	0.05
	(0.03)	(0.05)	(0.04)
Divorced/separated	0.27**	−0.10	−0.33**
	(0.09)	(0.15)	(0.10)
Difficulty in ADLs	−0.03**	−0.09*	−0.15***
	(0.01)	(0.04)	(0.02)
Rural residence	0.11***	0.12	0.27***
	(0.03)	(0.07)	(0.04)
Constant	2.93***	3.36***	2.90***
	(0.19)	(0.41)	(0.23)
Nonselection hazard a		0.16	--
		(0.24)	--
Living arrangement (ref: with someone)
Alone			−0.04
			(0.06)
In an institution			−0.55*
			(0.22)
Financial insecure			0.04
			(0.06)

Note:

^*p<.05

^**p<.01

^***p<.001.

All the independent variables are measured in 2005. Robust standard errors are in parentheses.

^aNonselection hazard (i.e., inverse of the Mill’s ratio) is estimated from the selection equation.