TABLE 3—

Descriptive Results for County-Level Repeat Drinking Water Violations Stratified by Population Served: United States, 2011–2015

County-Level Variable	Very Small (Population ≤ 3300; n = 47 499) OR (95% CI)	Small (Population = 3301–10 000; n = 5657) OR (95% CI)	Medium (Population = 10 001–50 000; n = 3769) OR (95% CI)	Large (Population ≥ 50 001; n = 1093) OR (95% CI)
Proportion female single headed householder	0.458 (0.335, 0.626)	1.491 (0.497, 4.470)	0.400 (0.090, 1.772)	0.052 (0.001, 2.165)
Median household income is $10 000	0.942 (0.913, 0.971)	0.814 (0.717, 0.924)	1.284 (1.097, 1.503)	0.326 (0.203, 0.523)
Log proportion renter occupied	1.229 (1.076, 1.403)	0.930 (0.574, 1.509)	0.753 (0.376, 1.506)	0.003 (0.000, 0.017)
Log proportion less than high school education	0.920 (0.833, 1.017)	0.324 (0.222, 0.474)	0.682 (0.405, 1.146)	0.015 (0.004, 0.051)
Log proportion non-Hispanic Black	0.897 (0.881, 0.913)	0.999 (0.935, 1.067)	1.197 (1.074, 1.334)	1.563 (1.127, 2.168)
Log proportion non-Hispanic Asian	1.002 (0.981, 1.024)	0.837 (0.764, 0.918)	0.800 (0.674, 0.949)	3.277 (1.650, 6.506)
Log proportion Hispanic	0.932 (0.907, 0.959)	1.171 (1.036, 1.323)	0.753 (0.626, 0.906)	4.399 (2.198, 8.804)
Log proportion non-Hispanic White	0.683 (0.626, 0.746)	0.731 (0.536, 0.999)	1.065 (0.571, 1.988)	0.477 (0.155, 1.469)
Log proportion uninsured	1.491 (1.355, 1.641)	2.243 (1.560, 3.224)	2.974 (1.794, 4.931)	4.147 (0.886, 19.42)

Note. CI = confidence interval; OR = odds ratio.