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Table 4 Number of headache days

From: Randomised controlled trial of food elimination diet based on IgG antibodies for the prevention of migraine like headaches

Time point Summary Sham True IRR (95% CI)* P-value
12 weeks** N Median (IQR) 69 20 (12 to 29) 69 19 (8 to 28) 1.15 (0.94 to 1.41) 1.17 (0.96 to 1.42) 0.18 0.11
4 weeks N Median (IQR) 78 8 (5 to 12) 78 7 (4 to 10) 1.23 (1.01 to 1.50) 1.24 (1.02 to 1.50) 0.04 0.03
  1. *Values in italics are the results from using multiple imputation to account for the missing data
  2. **Primary outcome