. Author manuscript; available in PMC: 2022 Apr 25.

Published in final edited form as: Lancet Planet Health. 2022 Apr;6(4):e320–e330. doi: 10.1016/S2542-5196(22)00043-2

Table 4:

90th percentile difference in CWS uranium concentration per 1% higher proportion of county populations classified as Hispanic/Latino

	Number of CWSs	Beta
All CWSs	14 644	15·1 (p<0·0001)
CWSs in the Southwest region	3268	25·9 (p<0·0001)
CWSs serving Semi-Urban, Hispanic counties	2058	11·2 (p=0·22)

Model results for the difference in CWS 90th percentile uranium concentrations per 1% higher proportion of population classified as Hispanic/Latino were derived from quantile regression models with the quantreg package (version 5.85) in R. Models were adjusted for state (categorical), the size of the population served by the CWS (continuous), and the source water type (surface water vs groundwater), and SEs were bootstrapped. The proportion of the county population classified as Hispanic/Latino was estimated for the 2010–19 period with use of US Census Bureau statistics.^24,25 CWS=community water system.