Table 1 Background characteristics of the adolescent patients with inflammatory bowel disease (IBD) and juvenile idiopathic arthritis (JIA)

No. of respondents

97

50

147

% of all respondents

66%

34%

n.a.

(% of recruited patients)

(76%*)

(51%*)

(65%)

Recruited during

74

40

113

Clinical visits (% of respondents)

(76%)

(80%)

(77%)

Recruited by mail

24

10

34

(% of respondents)

(24%)

(20%)

(23%)

Age, median (IQR)

15.5*

13.8*

14.7

(13.7-16.7)

(12.7-14.9)

(13.0-16.2)

Gender, male

51

17

68

(%)

(53%)

(34%)

(46%)

Disease duration

3.4*

6.9*

3.8

(years), median (IQR)

(1.3-5.4)

(2.7-10.1)

(1.6-7.6)

Disease subtype

Crohn’s: n = 46

Oligoarthritis: n = 18

Ulcerative colitis: n = 41

Polyarthritis: n = 25**

Enthesitis related: n = 4

Unclassified colitis: n = 10

Psoriasis related: n = 3