Table 3 Spearman correlation coefficient between test and retest of the SMI-M Questionnaire

1. Have you ever had recurrent headaches? [Pernahkah anda mengalami sakit kepala yang berulang-ulang?]

0.95

<0.001

2. Have you ever had moderate to severe headache accompanied by nausea and/or vomiting? [Pernahkah anda mengalami sakit kepala yang sederhana hingga teruk yang disertai rasa loya dan/atau muntah?]

0.87

<0.001

3. Have you ever had moderate to severe headache accompanied by hypersensitivity to sound or light? [Pernahkah anda mengalami sakit kepala yang sederhana hingga teruk yang disertai dengan hipersensitiviti kepada bunyi atau cahaya?]

0.88

<0.001

4. Have you ever had visual disturbances e.g., (Flashing lights, zigzag lines, blurred vision) Lasting 5-60 minutes followed by headache? [Pernahkah anda mengalami gangguan penglihatan contohnya (cahaya yang berkelip-kelip, garisan yang berbentuk zigzag, penglihatan yang kabur) berlanjutan selama 5 hingga 60 minit dan diikuti dengan sakit kepala?]

0.86

<0.001