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Table 1 Sex ratio in various rheumatological diseases.

From: Sex differences in rheumatoid arthritis: more than meets the eye...

Disease Female:male ratio
Sjögren's syndrome 9:1 [1]
Systemic lupus erythematosus 7:1 [2]
Rheumatoid arthritis 3:1 [3]
Systemic sclerosis 3:1 [4]
Psoriatic arthritis 1:1 [5]
Ankylosing spondylitis 1:3 [6]