Table 4 Inter-item tetra-choric correlation matrix of the Migraine Screen-Questionnaire (MS-Q) scores in Ethiopian university students
From: Migraine screen questionnaire: further psychometric evidence from categorical data methods
Items of the MS-Q | Mean ± SD | MSQ-1 | MSQ-2 | MSQ-3 | MSQ-4 | MSQ-5 |
|---|---|---|---|---|---|---|
MSQ-1 | 0.44 ± 0.50 | |||||
MSQ-2 | 0.25 ± 0.43 | 0.742 | ||||
MSQ-3 | 0.23 ± 0.42 | 0.623 | 0.683 | |||
MSQ-4 | 0.39 ± 0.49 | 0.613 | 0.631 | 0.708 | ||
MSQ-5 | 0.51 ± 0.51 | 0.598 | 0.595 | 0.571 | 0.731 |