Table 2. Summary of demographic data among Mn-exposed and control workers.

	Control	Mn-exposed
Number of subjects	48	71
Age (years) (95% CI)	37.2 ± 8.2 (34.5–39.8)	34 ± 5.3 (32.8–35.3)*
Gender (male/female)	40/8	56/15
Airborne Mn (mg/M3) (95% CI)	0.002 ± 0.002 (0.002–0.003)	0.18 ± 0.14 (0.13–0.24)**
Cumulative Mn exposure (g) (95% CI)	0.030 ± 0.015 (0.026–0.034)	6.42 ± 5.3 (4.40–8.44)**

Notes.

Data represent mean ± S.D.

^*p < 0.05.

^**p < 0.01 compared with the control group.