Table 4 Rate ratios and 95% confidence intervals (CIs) for subarachnoid haemorrhage occurring at least a year after admission for immune-mediated disease

Addison’s disease

18

1.82 (1.08-2.88)

0.02

Ankylosing spondylitis

34

1.55 (1.07-2.16)

0.01

Autoimmune haemolytic anaemia

11

1.87 (0.93-3.34)

0.06

Chronic active hepatitis

1

0.21 (0.01-1.2)

0.14

Coeliac disease

49

0.89 (0.66-1.18)

0.48

Crohn’s disease

133

1.32 (1.11-1.57)

0.002

Dermatomyositis

2

1.11 (0.13-4.02)

0.83

Diabetes mellitus

390

1.10 (0.99-1.22)

0.067

Goodpasture’s syndrome

2

3.12 (0.38-11.27)

0.28

Hashimoto’s thyroiditis

8

0.97 (0.42-1.91)

0.93

Idiopathic thrombocytopenia purpura

40

2.04 (1.45-2.78)

<0.001*

Multiple sclerosis

87

1 (0.8-1.24)

0.97

Myasthenia gravis

8

0.79 (0.34-1.55)

0.61

Myxoedema

823

1.02 (0.95-1.1)

0.53

Pemphigoid

9

1.03 (0.47-1.96)

0.94

Pemphigus

2

1.21 (0.15-4.37)

0.91

Pernicious anaemia

66

1.22 (0.95-1.56)

0.12

Polyarteritis nodosa

2

1.15 (0.14-4.15)

0.85

Polymyositis

6

1.72 (0.63-3.75)

0.28

Primary biliary cirrhosis

19

1.86 (1.12-2.9)

0.01

Psoriasis

122

1.35 (1.12-1.62)

0.001*

Rheumatoid arthritis

483

1.44 (1.31-1.58)

<0.001*

Scleroderma

19

1.83 (1.1-2.85)

0.012

Sjogren’s syndrome

34

1.94 (1.35-2.72)

<0.001*

Systematic lupus erythematosus

80

3.5 (2.77-4.36)

<0.001*

Thyrotoxicosis

153

1.38 (1.16-1.62)

<0.001*

Ulcerative colitis

167

1.03 (0.88-1.2)

0.71