Table 1.
Sociodemographic characteristics of participants and the Dutch general population.
Fig 1.
Total impact of DIF on the test characteristic curve (TCC) for anxiety and depression.
Table 2.
McFadden’s pseudo R2 and IRT parameters for items displaying DIF.
Table 3.
PROMIS anxiety and depression T-scoresa based on different sets of item parameters for different versions of the instruments.
Table 4.
PROMIS anxiety and depression Dutch reference valuesa by age and gender and comparisons with the US general population [58].
Fig 2.
Visual feedback [59] of PROMIS Anxiety and Depression scores, based on Dutch mean T-scores and Dutch thresholds for mild, moderate and severe symptoms.
The blue lines represent imaginary data showing the course of symptoms over three consecutive assessments (T1, T2 and T3).