Table 2 Demographic and clinical characteristics for the Application Dataset and the External Validation Dataset. Not all patients completed the headache diary. Complete data was available from 87 EM patients and 72 CM patients

Woman \(N^{\underline{\circ }}\). (%)

89 (61.8 %)

68 (82.9 %)

75 (82.4 %)

68 (91.9 %)

sex - \(\chi ^2\) = 3.56, P = 0.17^a  

Age, y

35.5 ± 12.0

35.7 ± 12.0

36.4 ± 9.9

37.8 ± 9.7

age - ANOVA = 0.86, P = 0.43^b

EM n = 87; CM n = 72;

     Duration of migraine history, y

14.1 ± 10.7

19.8 ± 10.7

t = -3.32, P = 0.001^c 

     Duration of Chronic migraine, mo

28.4 ± 35.3

     Headache frequency d/mo

3.5 ± 2.1

23.5 ± 6.0

U = 66, P < 0.001^d

     Migraine frequency d/mo

3.6 ± 2.0

13.6 ± 6.8

U = 225.5, P < 0.001^d