Table 4: Correlation coefficients in the Malaysian, Italian, American, and English studies.

ItemMalaysia1Italy2USA3UK4
Pearson’s
correlation
Spearman’s
correlation
Pearson’s
correlation
Spearman’s
correlation
Pearson’s
correlation
Spearman’s
correlation
Pearson’s
correlation
Spearman’s
correlation

10.920.870.640.740.680.690.660.56
20.940.840.770.810.540.650.710.65
30.880.770.650.630.600.630.820.58
40.830.810.720.640.640.590.600.56
50.710.770.540.490.620.710.520.46

Total0.910.870.810.770.800.780.830.77

A0.650.730.610.70NR*NR*NR*NR*
B0.860.890.640.65NR*NR*NR*NR*

NR: not reported; 1one hundred migraine patients from clinical studies; 2eighty-six migraine without aura patients from clinical series; 3ninety-seven migraine patients from the general population; 4one hundred migraine patients from the general population.