Table 2.

Oxidative stress, electrocardiogram findings, and blood pressure in control and lead-exposed groups in the lead–acid battery production industry.

	Control group(n = 94)	Lead-exposed group(n = 144)	P value
Blood lead, µg/L	65.3 ± 37.3	254.3 ± 120.1	<0.001
T-SOD, U/mL	48.4 ± 15.7	13.1 ± 5.1	<0.001
MDA, µmol/L	4.1 ± 0.7	6.7 ± 0.8	<0.001
Systolic pressure, mmHg	116.8 ± 10.1	121.4 ± 9.9	0.005
Diastolic pressure, mmHg	76.2 ± 7.3	79.8 ± 7.8	0.039
Abnormal electrocardiogram	14 (14.9)	43 (29.9)	0.008

Data are expressed as mean ± standard deviation or n (%). T-SOD, serum total superoxide dismutase; MDA, malondialdehyde.