TABLE 1. CHARACTERISTICS AT BASELINE (PRE-RANDOMIZATION).

	Total Longitudinal Panel (n=16,204)			Elevated Risk Subpanel (n=5,753)
Baseline Survey Data	Control n=9,950	Treatment n=6,254	p-value	Control n=3,548	Treatment n=2,205	p-value
Female (%)	55.5%	55.0%	0.559	64.3%	64.3%	0.996
Average Age, y	42.0	42.3	0.188	44.4	43.9	0.187
18–30 (%)	25.0%	24.4%	0.526	17.8%	18.6%	0.559
31–49 (%)	40.4%	41.9%	0.139	40.8%	41.7%	0.583
50–64 (%)	33.0%	32.8%	0.805	41.3%	39.8%	0.372
White (%)†	84.0%	83.4%	0.493	89.0%	89.9%	0.381
Black (%)†	3.2%	2.9%	0.360	2.7%	3.2%	0.997
Other Race (%)†	17.0%	17.4%	0.587	14.6%	12.9%	0.143
Hispanic (%)	9.8%	11.0%	0.070	6.3%	7.1%	0.310
Prior Cancer Diagnosis (%)	5.0%	5.1%	0.826	13.9%	14.2%	0.817
Reservation List Data
Average Age, y	42.13	42.05	0.696	42.71	42.64	0.800
Female (%)	55.3%	55.4%	0.854	55.4%	55.3%	0.986
English Speaking Household (%)	95.3%	94.6%	0.107	98.4%	97.9%	0.178

Notes: Data come from the baseline (pre-randomization) survey or the Reservation List administrative database. P-values were calculated using ordinary least squares regression. All regressions include indicators for household size and eligibility status for each lottery draw.

†More than one race code possible, will not necessarily sum to 100% across categories.