Table 2.

Occupation and other potential predictors of fine motor tests with both hands in 1232 men (mixed Poisson regression).

Variable		Value		N a		Tapping hits						Line tracing errors						Steadiness errors						Aiming errors
						Exp(β)		95% CI				Exp(β)		95% CI				Exp(β)		95% CI				Exp(β)		95% CI
Intercept				2464		267		253		281		9.27		7.86		10.9		0.88		0.61		1.28		0.08		0.03		0.18
Occupation		Blue-collar without Mn exposure (last occupation)		474		1						1						1						1
		Welders		48		0.98		0.95		1.02		0.96		0.85		1.07		0.70		0.51		0.95		1.12		0.68		1.83
		Occasional welding		390		1.02		1.00		1.03		0.99		0.94		1.04		0.89		0.79		1.00		0.71		0.54		0.92
		Other potential Mn exposure		206		1.04		1.01		1.06		0.98		0.92		1.04		0.86		0.75		1.00		0.83		0.61		1.13
		Manually skilled		224		1.01		0.98		1.03		0.99		0.93		1.05		0.80		0.69		0.93		0.66		0.48		0.92
		White-collar		1122		1.03		1.02		1.05		0.98		0.94		1.02		0.96		0.88		1.06		0.77		0.63		0.94
Age [per 10 years]				2464		0.93		0.92		0.94		1.18		1.16		1.21		1.56		1.48		1.64		1.32		1.18		1.49
Smoking status		Never		734		1						1						1						1
		Former		1374		1.00		0.99		1.01		1.02		0.98		1.06		1.02		0.94		1.11		1.16		0.96		1.40
		Current		356		0.97		0.95		0.98		1.06		1.01		1.11		1.26		1.13		1.42		1.23		0.95		1.60
Hand		Non-dominant		1232		1						1						1						1
		Dominant		1232		1.11		1.09		1.12		0.89		0.86		0.92		0.98		0.91		1.05		0.36		0.30		0.43
Test time [sec]				2464								1.01		1.00		1.01								1.07		1.05		1.09

^aNumber of measurements.