Table 1.

Summary statistics for the curated dataset used in this analysis

Variable	n (%)	Arithmetic mean blood lead, µg/dL
Total	59,483 (100)	1.73
Water source
Private well	7,709 (14.9)	1.75
Regulated water utility	43,982 (85.1)	1.59
Age (mo)
0–8	478 (0.8)	1.71
9–14	39,688 (66.7)	1.63
15–19	3,844 (6.5)	1.99
20–29	8,603 (14.5)	1.80
≥30	6,870 (11.6)	2.07
Biological sex
Female	28,752 (49.3)	1.72
Male	29,578 (50.7)	1.74
Year tested
2002–2006	15,307 (25.7)	2.46
2007–2012	24,149 (40.6)	1.70
2013–2017	20,027 (33.7)	1.20
Year house was built
Before 1950	3,401 (5.9)	2.14
1950–1977	12,102 (20.8)	1.89
1978–1987	7,874 (13.6)	1.79
1988–1997	9,908 (17.1)	1.74
1998–2002	10,003 (17.2)	1.71
2003–2007	10,330 (17.8)	1.48
2008 or later	4,473 (7.7)	1.30
Home value
Quartile 1 (<$132,880)	13,854 (25.0)	2.00
Quartile 2 ($132,881–188,281)	13,855 (25.0)	1.73
Quartile 3 ($188,282–292,135)	13,853 (25.0)	1.56
Quartile 4 (>$292,135)	13,854 (25.0)	1.52
Black population proportion in census block group
Quartile 1 (<0.095)	14,927 (25.0)	1.58
Quartile 2 (0.095–0.211)	14,827 (25.2)	1.64
Quartile 3 (0.212–0.370)	14,918 (25.0)	1.78
Quartile 4 (>0.370)	14,794 (24.9)	1.91
Median income in census block group
Quartile 1 (<$49,012)	14,867 (25.0)	1.96
Quartile 2 ($49,012–62,925)	14,905 (25.1)	1.78
Quartile 3 ($62,926–83,985)	15,291 (25.7)	1.64
Quartile 4 (>$83,985)	14,398 (24.2)	1.53
Blood draw type
Capillary	5,446 (9.7)	1.76
Venous	50,876 (90.3)	1.70
Season
Winter	13,658 (23.0)	1.73
Spring	14,942 (25.1)	1.70
Summer	15,473 (26.0)	1.77
Fall	15,410 (25.9)	1.73