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Table 7 Comparable reliability score with the original and some MIDAS versions

From: Validity and reliability of the Portuguese version of the modified Migraine Disability Assessment

Country Language Source Test-retest reproducibility Internal consistency
Portugal Portuguese   0.90 b 0.80
Lebanon Arabic 14 0.99 b 0.81
Taiwan Chinese 15 0.79 a 0.67
USA English 8 0.80 a 0.76
UK English 8 0.83 a 0.73
Canada French 16 0.84 b NA
Switzerland German 17 0.99 b 0.69
Greece Greek 18 0.82 b 0.71
India Hindi 19 0.94 a > 0.90
Italia Italian 20 0.81 a 0.74
Japan Japanese 21 0.83 a 0.82
Malaysia Malay 22 0.87 a 0.84
Iran Persian 23 0.71 a 0.80
Brasil Portuguese 24 0.77 a 0.70
Spain Spanish 25 0.81 b 0.80
Thailand Thai 26 0.76 b 0.91
Turkey Turkish 27 0.68 a 0.73
  1. aPearson’s/Spearman’s correlation coefficient; bInterclass correlation coefficient
  2. NA not available in the paper