Adjusted prediction of weekly hours of help received from a child, by distance using a dummy variable for each proximity category (Sample: Dyads of parents aged 55+ with a disability and their children aged 25+; N=1,767)

		Unadjusted estimates		Adjusted estimates (using two-part model)
		Mean		First part (logit)			Second part (Gamma with log link)			Combined
	N	Weighted values	95% CI	ARR	p-value	95% CI	Coef.	p-value	95% CI	Predicted values	95% CI
Coresident	292	8.59	[5.71 11.47]	1.29	0.16	[0.90 1.83]	1.73	<0.001	[1.21 2.25]	5.34	[2.87 7.8]
Same block	111	6.73	[2.96 10.60]	1.07	0.75	[0.71 1.62]	1.67	<0.001	[1.04 2.29]	4.16	[1.63 6.70]
<=2 miles, not same block	202	2.10	[1.23 2.97]	1.31	0.14	[0.92 1.87]	0.22	0.38	[−0.27 0.72]	1.20	[0.70 1.70]
2–5 miles	199	2.84	[1.34 4.34]	1.00	0.99	[0.69 1.46]	0.75	0.01	[0.16 1.34]	1.56	[0.65 2.46]
5–10 miles	176	0.97	[0.43 1.50]	(ref)	(ref)	(ref)	(ref)	(ref)	(ref)	0.73	[0.32 1.15]
10–30 miles	226	0.62	[0.29 0.95]	0.63	0.02	[0.42 0.94]	−0.07	0.82	[−0.7 0.56]	0.43	[0.18 0.68]
30–100 miles	155	1.43	[0.19 2.66]	0.48	0.003	[0.30 0.78]	0.76	0.07	[−0.06 1.57]	0.75	[0.10 1.41]
>100 miles	406	0.80	[0.32 1.28]	0.41	<0.001	[0.27 0.63]	0.61	0.04	[0.04 1.18]	0.56	[0.22 0.90]

Note: Dummy variables for categories of proximity were used (reference category was 5–10 miles). Adjustment variables include parent’s age, gender, race/ethnicity, spousal status, number of children, and wealth (adjusted by household size), and child’s, age, gender, education, working status, and the status of having a minor child. Predicated values for the adjusted model were evaluated by holding all covariates at their mean values of the corresponding analysis sample (N=1,767).