Table 2. Characteristics of the study population.

			Non-Parkinson's Disease (N = 28,345)			Parkinson's Disease (N = 433)
	Min	Max	Mean	SD	%	Mean	SD	%
Background Characteristics
Age at baseline, years	30.00	82.00	46.06	9.23	.	51.92	7.42	.
Time to end of follow-up, years	0.08	39.00	26.93	7.41	.	22.57	7.46	.
Women	.	.	.	.	46.36	.	.	39.49
Current smoker (baseline)	.	.	.	.	39.04	.	.	21.71
Occupational Complexity
Data	0.00	6.00	2.82	1.67	.	2.95	1.66	.
People	0.00	8.00	1.65	1.59	.	1.71	1.66	.
Things	0.00	6.80	2.83	2.24	.	2.74	2.31	.