Table 3.

Differences in blood lead levels (μg/dL) by gender and age groups.

		Ban Thi, Bac Kan			Tan Long, Thai Nguyen
		n	Mean ± SD	95% CI	n	Mean ± SD	95% CI
Age group (years)	<6	45	16.9 ± 6.74	14.87-18.92	55	12.94 ± 11.11	9.93-15.94
	6-10	113	15.31 ± 6.52	14.09-16.52	97	13.31 ± 11.28	11.03-15.57
	11-14	37	13.92 ± 5.58	12.05-15.77	56	14.29 ± 12.33	10.98-17.58
p value∗			0.08			0.78
Gender	Boys	110	16.45 ± 5.98	15.32-17.59	123	13.84 ± 11.19	11.84-15.84
	Girls	85	14.06 ± 6.80	12.59-15.52	85	12.92 ± 11.92	10.35-15.5
p value∗∗			<0.001			0.36

^∗Kruskal-Wallis test. ^∗∗Mann–Whitney test.