Validity and reliability of the Malay version of the Structured Migraine Interview (SMI) Questionnaire

Table 2 The SMI-M versus neurologist’s clinical diagnoses “gold standard”

Note: Sensitivity: a/(a + c) = 97 / (97 + 3) = 0.97.
Specificity: d/(b + d) = 36 / (36 = 15) = 0.63.
Misclassification rate: (b + c) / (a + b + c + d) = (21 + 3)/(97 + 21 + 3 + 36) = 0.15.
Positive predictive value: a/(a + b) = 97/(97 + 21) = 0.82.
Negative predictive value: d/(c + d) = 36 /(36 + 3) =0.92.
Positive likelihood ratio: Sensitivity / (1-specificity) = 0.97 / (1-0.63) = 2.62.
Negative likelihood ratio: (1-Sensitivity) / specificity = (1-0.97) / 0.63 = 0.048.

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