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+ without a disability and their children aged 25+; N=3,608)

		Unadjusted estimates		Adjusted estimates (using two-part model)
		Mean		First part (logit)			Second part (Gamma with log link)			Combined
	N	Weighted value	95% CI	ARR	p-value	95% CI	Coef.	p-value	95% CI	Predicted values	95% CI
Coresident	562	1.67	[0.85 2.48]	1.22	0.32	[0.83 1.81]	0.89	0.004	[0.28 1.49]	1.04	[0.52 1.55]
Same block	230	1.30	[0.45 2.15]	1.11	0.66	[0.70 1.78]	0.93	0.004	[0.30 1.55]	0.98	[0.34 1.63]
<=2 miles, not same block	316	0.60	[0.27 0.94]	1.15	0.49	[0.77 1.71]	0.20	0.52	[−0.41 0.81]	0.49	[0.24 0.74]
2–5 miles	294	0.35	[0.20 0.50]	1.27	0.22	[0.86 1.88]	−0.34	0.22	[−0.88 0.21]	0.32	[0.17 0.46]
5–10 miles	369	0.38	[0.17 0.58]	(ref)	(ref)	(ref)	(ref)	(ref)	(ref)	0.35	[0.15 0.55]
10–30 miles	479	0.22	[0.11 0.33]	0.74	0.14	[0.50 1.10]	−0.51	0.10	[−1.11 0.10]	0.16	[0.08 0.24]
30–100 miles	398	0.33	[0.04 0.62]	0.63	0.04	[0.41 0.98]	0.29	0.49	[−0.54 1.12]	0.30	[0.04 0.55]
>100 miles	960	0.08	[0.04 0.12]	0.36	<0.001	[0.22 0.60]	−0.46	0.09	[−1.00 0.07]	0.08	[0.04 0.13]

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=3,608).