Table 3.

Logistic regression analysis of BLL above 10 µg/dL and 5 µg/dL among preschool children in Jintan, China

Characteristics		≥ 10 µg/dL		≥ 5µg/dL
		ORs and 95% CI	p-value	ORs and 95% CI	p-value
Sex	Boys	1.77 (1.14 –2.74)	0.011	1.55 [1.20, 2.01]	0.001
	Girls	Reference
Age (years)	5	2.28 (1.10 –4.70)	0.018	2.65 [1.91, 3.68]	<0.0001
	4	2.73 (1.36 –5.46)		6.20 [4.36, 8.81]
	3	Reference
Mother’s age when the child was born	<25	1.80 (0.78 –4.15)	0.545	1.28 [0.79, 2.07]	0.020
	25–29	1.61 (0.72 –3.58)		0.80 [0.53, 1.26]
	30-	Reference
Father’s highest degree	Primary school	3.81 (1.10 –13.19)	0.069	0.79 [0.29, 2.11]	0.886
	Middle school	2.45 (1.10 –5.43)		0.96 [0.61, 1.48]
	High school	2.81 (1.37 –5.78)		0.85 [0.59, 1.25]
	College/University	Reference
Mother’s highest degree	Primary school	1.58 (0.46 –5.44)	0.858	1.07 [0.43, 2.64]	0.212
	Middle school	1.28 (0.51 –3.22)		0.93 [0.57, 1.52]
	High school	1.10 (0.46 –2.63)		0.69 [0.44, 1.07]
	College/University	Reference
Father’s occupation	Skilled labor/driver	1.25 (0.62 –2.51)	0.086	1.49 [0.69, 3.21]	0.821
	Professional workers	2.21 (1.05 –4.66)		1.86 [0.83, 4.21]
	Unemployed/unskilled labor	Reference
Mother’s occupation	Skilled labor/driver	1.60 (0.92 –2.76)	0.380	0.71 [0.35, 1.41]	0.418
	Professional workers	1.32 (0.63 –2.78)		0.50 [0.23, 1.07]
	Unemployed/unskilled labor	Reference
Having sibling	Yes	2.18 (1.12 –4.24)	0.021	1.30 [0.76, 2.22]	0.341
	No	Reference
Living in a crowded neighborhood	Yes	1.31 (0.83 –2.08)	0.250	1.56 [1.15, 2.13]	0.004
	No	Reference
Parent smoking at home	Yes	1.03 (0.47 –2.23)	0.946	1.52 [0.86, 2.70]	0.145
	No	Reference

ORs, odds rations; 95% CI, 95% confidence interval.