Table 1 Risks of first hospital admission according to ICD9-CM classification after date of diagnosis in CD subjects compared to matched references^a

001–V89

Any

1245

33072

499

5915

2.34 (2.08–2.63)

001–139

Infectious and parasitic diseases

73

40900

44

9396

2.79 (1.89–4.12)

140–239

Neoplasms

56

41220

27

9686

1.89 (1.16–3.08)

240–279

Endocrine. metabolic. immunity dis.

96

40936

69

9328

3.19 (2.32–4.40)

280–289

Dis. of the blood and blood–forming organs

23

41334

25

9614

4.47 (2.49–8.01)

290–319

Mental disorders

60

41203

35

9618

2.52 (1.64–3.87)

320–389

Dis. of the nervous system and sense organs

114

40681

56

9414

2.14 (1.53–2.98)

390–459

Dis. of the circulatory system

29

41405

16

9766

2.77 (1.49–5.18)

460–519

Dis. of the respiratory system

347

38348

121

8763

1.59 (1.28–1.98)

520–579

Dis. of the digestive system

220

40228

232

7846

5.59 (4.57–6.83)

580–629

Dis. of the genito–urinary system

94

40861

42

9533

1.95 (1.32–2.86)

630–679

Complications of pregnancy and puerperium

46

41394

15

9807

1.48 (0.82–2.67)

680–709

Dis. of skin and subcutaneous tissue

55

41215

16

9722

1.22 (0.68–2.17)

710–739

Dis. of the muscoloskeletal tissue

104

41056

27

9716

0.88 (0.55–1.44)

740–779

Congenital anomalies/Perinatal conditions

90

40902

44

9482

2.18 (1.50–3.17)

780–799

Ill-defined conditions

83

40898

55

9413

2.94 (2.06–4.19)

800–999

Injuries and poisoning

167

41491

57

9840

1.35 (0.98–1.86)

V01–V89

Factors influencing health status

58

41092

41

9468

2.94 (1.94–4.47)