TABLE 3. Association Between Elevated Corrosivity (>75th Percentile LSI) and Dichotomous WLL, by Housing Age Category.

Home Built	Pb Detection, OR (95% CI)	Pb ≥2 ppb, OR (95% CI)	Pb ≥5 ppb, OR (95% CI)
1986 and earlier	2.32 (0.86-6.21)	3.17 (1.24-8.06)a	4.50 (1.16-17.50)a
1987 and later	1.94 (0.40-9.49)	1.94 (0.31-12.12)	Unstable estimate

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

^aP < .05.