Left-handers have a lower prevalence of arthritis and ulcer.
In a very large study (N = 1,247,344), left-handedness showed no association with allergies overall (and an inconsistent association with individual allergies), but there was strong evidence that left-handers had lower rates of arthritis and ulcer--Arthritis: Odds-ratio (OR) = 0.942, 95% CI 0.922-0.962; Ulcer: OR = 0.920, 95% CI 0.896-0.944.
McManus
I C
IC
Department of Psychology, University College London, UK. i.mcmanus@ucl.ac.uk
Wysocki
C J
CJ
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001168:Arthritis / Q000453:epidemiology*; D003430:Cross-Sectional Studies; D003920:Diabetes Mellitus / Q000453:epidemiology; D005260:Female; D007839:Functional Laterality; D006306:Health Surveys; D006801:Humans; D006967:Hypersensitivity / Q000453:epidemiology; D006973:Hypertension / Q000453:epidemiology; D015994:Incidence; D008297:Male; D008875:Middle Aged; D016017:Odds Ratio; D010437:Peptic Ulcer / Q000453:epidemiology*; D014481:United States