Table 3 Rate ratios and 95% confidence intervals (CIs) for subarachnoid haemorrhage occurring within a year after admission for immune-mediated disease

Addison’s disease

7

2.77 (1.11-5.73)

0.01

Ankylosing spondylitis

12

1.99 (1.02-3.49)

0.03

Autoimmune haemolytic anaemia

5

2.33 (0.75-5.44)

0.11

Chronic active hepatitis

0

0 (0-3.75)

0.63

Coeliac disease

23

1.62 (1.03-2.45)

0.03

Crohn’s disease

26

1.16 (0.75-1.71)

0.52

Dermatomyositis

1

1.75 (0.04-9.77)

0.93

Diabetes mellitus

144

1.68 (1.40-2.00)

<0.001*

Goodpasture’s syndrome

0

0 (0-16.34)

0.56

Hashimoto’s thyroiditis

2

0.95 (0.11-3.42)

0.79

Idiopathic thrombocytopenia purpura

22

3.72 (2.32-5.66)

<0.001*

Multiple sclerosis

28

1.47 (0.97-2.14)

0.06

Myasthenia gravis

4

1.44 (0.39-3.71)

0.66

Myxoedema

460

1.54 (1.38-1.72)

<0.001*

Pemphigoid

7

1.91 (0.77-3.94)

0.14

Pemphigus

1

1.75 (0.04-9.77)

0.92

Pernicious anaemia

30

1.5 (1.01-2.15)

0.04

Polyarteritis nodosa

2

4.11 (0.5-14.88)

0.15

Polymyositis

2

2.12 (0.26-7.67)

0.57

Primary biliary cirrhosis

11

3.32 (1.65-5.96)

<0.001*

Psoriasis

34

1.31 (0.9-1.84)

0.15

Rheumatoid arthritis

157

1.63 (1.37-1.93)

<0.001*

Scleroderma

6

1.9 (0.69-4.14)

0.19

Sjogren’s syndrome

5

0.89 (0.29-2.08)

0.96

Systematic lupus erythematosus

28

4.78 (3.16-6.95)

<0.001*

Thyrotoxicosis

49

1.38 (1.02-1.84)

0.03

Ulcerative colitis

31

0.87 (0.59-1.24)

0.49