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Table 2 Birth percentages and monthly odds ratios with 95%CI for each and all immune-mediated diseases

From: Month of birth, vitamin D and risk of immune-mediated disease: a case control study

Month All immune-mediated diseases Multiple sclerosis Rheumatoid arthritis
  Birth % OR 95% CI Birth % OR 95% CI Birth % OR 95% CI
Jan 8.63 1.02 + 0.99 to 1.04 8.51 1.01 0.97 to 1.05 8.44 0.99 0.95 to 1.03
Feb 7.90 1.01 0.99 to 1.04 7.76 0.99 0.95 to 1.03 7.94 1.02 0.98 to 1.06
Mar 8.88 1.00 0.98 to 1.02 8.67 0.97 0.93 to 1.01 8.99 1.01 0.98 to 1.05
Apr 8.77 1.05 + 1.02 to 1.07 8.79 1.05 + 1.002 to 1.09 8.78 1.05 + 1.01 to 1.08
May 8.83 1.01 0.99 to 1.03 9.41 1.08 + 1.04 to 1.13 8.64 0.99 0.95 to 1.03
Jun 8.44 1.01 0.99 to 1.04 8.70 1.04 1.01 to 1.09 8.47 1.02 0.98 to 1.06
Jul 8.49 0.99 0.97 to 1.01 8.51 0.99 0.95 to 1.04 8.37 0.98 0.94 to 1.01
Aug 8.16 0.97 - 0.95 to 0.99 8.20 0.98 0.94 to 1.02 8.14 0.97 - 0.93 to 1.00
Sep 8.12 1.00 0.97 to 1.02 7.94 0.96 0.92 to 1.01 8.10 1.00 0.96 to 1.03
Oct 8.05 0.95 - 0.92 to 0.97 8.08 0.96 - 0.92 to 1.00 8.20 0.96 - 0.93 to 0.99
Nov 7.61 0.98 0.96 to 1.00 7.43 0.96 - 0.91 to 1.00 7.65 0.99 0.95 to 1.02
Dec 8.11 1.01 0.99 to 1.03 8.01 1.00 0.96 to 1.04 8.30 1.04 + 1.00 to 1.07
Month Ulcerative colitis Systemic lupus erythematosus Crohn's disease
  Birth % OR 95% CI Birth % OR 95% CI Birth % OR 95% CI
Jan 8.63 1.02 0.97 to 1.06 9.57 1.14 + 1.03 to 1.27 8.99 1.06 + 1.01 to 1.11
Feb 8.07 1.04 + 0.99 to 1.09 7.86 1.00 0.90 to 1.13 7.84 1.01 0.96 to 1.06
Mar 8.90 1.00 0.96 to 1.05 8.75 0.98 0.88 to 1.09 8.94 1.01 0.96 to 1.06
Apr 8.92 1.06 + 1.02 to 1.11 8.85 1.05 0.95 to 1.18 8.54 1.02 0.97 to 1.07
May 8.73 1.00 0.96 to 1.05 9.71 1.12 + 1.01 to 1.24 8.40 0.96 - 0.91 to 1.01
Jun 8.25 0.99 0.94 to 1.04 7.61 0.90 0.81 to 1.02 8.44 1.02 0.97 to 1.07
Jul 8.44 0.99 0.94 to 1.03 8.58 1.00 0.90 to 1.12 8.75 1.03 0.98 to 1.08
Aug 8.15 0.97 - 0.93 to 1.02 8.40 1.00 0.90 to 1.12 8.13 0.97 0.92 to 1.02
Sep 8.18 1.00 0.96 to 1.05 7.51 0.91 - 0.81 to 1.02 8.45 1.04 + 0.99 to 1.10
Oct 7.91 0.93 - 0.88 to 0.97 7.93 0.94 0.84 to 1.05 7.89 0.92 - 0.87 to 0.97
Nov 7.69 0.99 0.95 to 1.04 7.09 0.91 - 0.81 to 1.03 7.78 1.00 0.95 to 1.06
Dec 8.13 1.01 0.97 to 1.06 8.13 1.02 0.91 to 1.14 7.84 0.97 0.93 to 1.03
  1. + and - indicate highest and lowest odds ratios, respectively. CI: confidence intervals; OR: odds ratio.