TABLE 2. Single Predictor Models of Water Pb Detection and WLL ≥2 ppb.

Predictor	Outcome: Pb Detection, OR (95% CI)	Outcome: WLL ≥2 ppb, OR (95% CI)
House built 1986 or earlier	5.18 (2.35-11.42)a	2.88 (1.16-7.16)b
House built pre-1964 (25th percentile)	1.42 (0.65-3.09)	0.41 (0.15-1.16)
House built pre-1978 (median)	2.22 (1.13-4.34)b	1.25 (0.59-2.63)
House built pre-1994 (75th percentile)	4.23 (1.82-9.81)c	3.07 (1.10-8.57)b
LSI (continuous)	1.95 (0.98-3.89)	2.14 (1.08-4.27)b
LSI ≥0.08 (25th percentile)	2.26 (1.03-4.95)b	2.19 (0.84-5.73)
LSI ≥0.23 (Median)	1.77 (0.93-3.38)	3.27 (1.49-7.18)c
LSI ≥0.63 (75th percentile)	2.38 (1.12-5.06)b	3.32 (1.52-7.23)c

Abbreviations: CI, confidence interval; LSI, Larson-Skold Index; OR, odds ratio; Pb, lead; WLL, well lead level.

^aP < .001.

^b.01 ≤ P < .05.

^c.0001 < P <.01.