Differential item functioning (DIF) | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Item number | Item | Location | 2SE | FitResid | Prob | Disordered thresholds | Cohort | Gender | Age Group | Education | |
SEMCD—full scale | 1 | Confidence in keeping fatigue from interfering | 0.36 | 0.07 | -0.91 | 0.02 | x | x | x | ||
2 | Confidence in keeping pain/physical discomfort from interfering | -0.06 | 0.06 | -0.35 | 0.01 | ||||||
3 | Confidence in keeping emotional distress from interfering | 0.30 | 0.07 | -1.31 | 0.06 | x | x | x | x | ||
4 | Confidence in keeping other symptoms from interfering | 0.02 | 0.07 | -2.16 | 0.01 | ||||||
5 | Confidence in reduce need to the doctor | -0.13 | 0.07 | -0.63 | 0.45 | ||||||
6 | Confidence in reduce the illness effects | -0.49 | 0.06 | 5.80 | 0.00 | x | x | x | x | ||
SEMCD item 1–5 | 1 | Confidence in keeping fatigue from interfering | 0.30 | 0.08 | -0.69 | 0.11 | x | x | |||
2 | Confidence in keeping pain/physical discomfort from interfering | -0.18 | 0.07 | 0.22 | 0.09 | ||||||
3 | Confidence in keeping emotional distress from interfering | 0.26 | 0.08 | -1.31 | 0.23 | x | |||||
4 | Confidence in keeping other symptoms from interfering | -0.10 | 0.07 | -1.22 | 0.10 | ||||||
5 | Confidence in reduce need to the doctor | -0.28 | 0.07 | 3.06 | 0.32 | ||||||
SEMCD item 1–4 | 1 | Confidence in keeping fatigue from interfering | 0.25 | 0.08 | -0.31 | 0.13 | x | ||||
2 | Confidence in keeping pain/physical discomfort from interfering | -0.28 | 0.08 | -0.10 | 0.10 | ||||||
3 | Confidence in keeping emotional distress from interfering | 0.22 | 0.08 | -0.72 | 0.22 | x | x | ||||
4 | Confidence in keeping other symptoms from interfering | -0.19 | 0.08 | 0.99 | 0.49 | ||||||
SEMCD item 1–4, response options 4–5-6 collapsed for item 1 | 1 | Confidence in keeping fatigue from interfering | 0.47 | 0.10 | 0.44 | 0.03 | x | ||||
2 | Confidence in keeping pain/physical discomfort from interfering | -0.36 | 0.08 | -0.10 | 0.07 | ||||||
3 | Confidence in keeping emotional distress from interfering | 0.16 | 0.08 | -0.48 | 0.56 | x | x | ||||
4 | Confidence in keeping other symptoms from interfering | -0.27 | 0.08 | 1.23 | 0.16 |