TABLE 1.

Summary of Demographic Data in Fume-Exposed Welders and Control Subjects

	Welders (n = 37)	Nonwelders (n = 52)
Age (years)	38.1 ± 1.54	34.8 ± 1.46
Sex	24(M) /13(F)	30(M) /22(F)
Years in employment	2–36	1–38
Initial age at employment (years)	22.0 ± 3.23	21.3 ± 3.02
Smoking (pack-years) (consumptive ratio)	81.8 ± 106.3 (54.0%)	70.2 ± 90.01 (52.0%)
Alcohol (mL-days) (consumptive ratio)	35.1 ± 52.53 (35.1%)	40.0 ± 58.90 (40.0%)
Airborne Mn in working place (MnD2)	1.45 ± 1.08 (mg/m3)	0.11 ± 0.07* (μg/m3)

Data represent mean ± standard deviation. No significant statistical difference existed between the 2 groups unless otherwise stated.

^*P < 0.001.