Table 3. Incidence rate of dermatomyositis and polymyositis in men.

Age at baseline (years)	UC (n = 1704)			Control subjects (n = 7955)
	No.a	follow-upb	Incidence ratec	95% CI	No.	follow-up	Incidence rate	95% CI
DM
Total	1	7506.17	0.13	0.00–0.74	1	33785.25	0.03	0.00–0.16
PM
Total	1	7507.83	0.13	0.00–0.74	2	33784.67	0.06	0.01–0.21

^aNumbers of new diagnosed DM/PM.

^bThe total follow-up period (person-years).

^cIncidence rate per 1000 person-years.