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Table 5 Fisher’s exact tests and related odds ratio (OR) for average arsenic level, 2005-2007, San Joaquin Valley, CA

From: Environmental justice implications of arsenic contamination in California’s San Joaquin Valley: a cross-sectional, cluster-design examining exposure and compliance in community drinking water systems

Variable of interest ≥ 10 μg As/L < 10 μg As/L OR (95% CI) p-value
High % Homeownership 28 233 .45 (.25, .72) .002
Low % Homeownership 44 159   
High % People of Color 35 162 1.3 (.81, 2.2) .3
Low % People of Color 37 230   
  1. Fisher’s Exact test compares high and low categories of the variable of interest to CWSs whose average arsenic was above or below the revised MCL. The threshold for the variable of interest is determined by median value across all CWS, and includes related odds ratio. Test compares demographics for community water systems whose average arsenic was above or below the revised MCL.