Table 2 Incidence rate of dermatomyositis and polymyositis in ulcerative colitis patients and control subjects stratified by age.

From: Increased Cumulative Incidence of Dermatomyositis in Ulcerative Colitis: a Nationwide Cohort Study

Age at baseline (years)

UC (n = 3133)

Control subjects (n = 14726)

No.a

follow-upb

Incidence ratec

95% CI

No.

follow-up

Incidence rate

95% CI

DM

 20–69

4

12101.58

0.33

0.09–0.85

6

58502.42

0.10

0.04–0.22

 > = 70

1

1699.92

0.59

0.01–3.28

1

7006.42

0.14

0.00–0.79

 Total

5

13801.50

0.36

0.12–0.85

7

65508.83

0.11

0.04–0.22

PM

 Total

3

13822.83

0.22

0.04–0.63

10

65481.17

0.15

0.07–0.28

  1. aNumbers of new diagnosed DM/PM.
  2. bThe total follow-up period (person-years).
  3. cIncidence rate per 1000 person-years.
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