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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