Table 2. Mortality in a large male cohort compared to the Dutch population according to a priori risk classification.

Risk group	No of men	Person years	No of deaths	Standardized mortality ratio (95% confidence interval)
1	24,666	358,296	942	0.54 (0.50 to 0.57)
2	22,137	302,857	1,185	0.70 (0.66 to 0.74)
3	11,164	138,841	739	0.96 (0.89 to 1.03)
4	3,469	36,728	389	1.57 (1.41 to 1.73)
5	898	8,092	178	2.37 (2.04 to 2.75)
Total group	62,334	844,815	3,433	0.76 (0,73 to 0.78)