Table 1.

Blood lead levels in Korean lead workers measured during a special health examination (2003–2011)

	n (%)	Age (years; mean ± SD)	BLL (μg/dL; GM (95% CI))	p-value*
Total	365331 (100)	37.8 ± 9.9	4.35 (4.34-4.36)
Men	310724 (85.0)	38.2 ± 9.7	4.62 (4.61-4.63)	< 0.001
Women	54607 (14.9)	35.4 ± 10.6	3.09 (3.07-3.11)

*determined using a t-test.

SD, standard deviation; BLL, blood lead level; GM, geometric mean; CI, confidence interval.