Differential item functioning | Results (Original 10-item DLQI) |
---|---|
Age | Item 2: more agreement among people < 35 (p = .028) |
Item 4: more agreement among people < 35 (p = .015) | |
Sex | No DIF |
Location | No DIF |
Education | Item 4: more agreement for higher education (p = .038) |
Severity of illness | Item 4: more agreement for patients with more severe condition (p = .027) |
Item 8: more agreement for patients with more severe condition (p = .041) |