Table 2 Summary of Rasch measurement model on PedsQL™ 3.0 Neuromuscular Module Indonesian Version child self-report
Parameter (with quality criteriaa) | The PedsQL™ 3.0 Neuromuscular Module Indonesian Version | |||
|---|---|---|---|---|
Total scale | About My Child’s Neuromuscular Disease Subscale | Communication Subscale | About Our Family Resources Subscale | |
Model fit: summary of item | ||||
Item mean in logits (criteria: 0.0 logits) | 0.0, SD = 0.37 | 0.0, SD = 0.42 | 0.0, SD = 0.22 | 0.0, SD = 0.42 |
Item reliability (criteria: good 0.81–0.90; very good 0.91–0.94; excellent > 0.94) | 0.81 | 0.90 | 0.00 | 0.77 |
Item separation (criteria: > 3) | 2.06 | 3.02 | 0.00 | 1.81 |
Separate item strata = [(4 × separation index) + 1] / 3 (criteria: fair, 2–3; good, 3–4; very good, 4–5; excellent, > 5) | 3.08 \(\approx\) 3 levels | 4.36 \(\approx\) 4 levels | 0.33 \(\approx\) 0 level | 2.75 \(\approx\) 3 level |
Item misfit MNSQ range extremes (criteria: good 0.5–2.0; very good 0.7–1.4; excellent 0.77–1.3) | Infit: 0.53–1.45 Outfit: 0.50–1.73 | Infit: 0.74–1.34 Outfit: 0.61–1.58 | Infit: 0.65–1.65 Outfit: 0.60–1.60 | Infit: 0.81–1,29 Outfit: 0.82–1.13 |
Point measure correlation (criteria: 0.4–0.85) | 0.31–0.73 | 0.37–0.75 | 0.82–0.90 | 0.71–0.81 |
Model fit: summary of persons | ||||
Person mean in logits (criteria: 0.0 logits) | -1.12, SD = 0.92 | -1.02, SD = 0.96 | -2.34, SD = 1.83 | -1.69, SD = 1.65 |
Person reliability (criteria: good 0.81–0.90; very good 0.91–0.94; excellent > 0.94) | 0.81 | 0.74 | 0.36 | 0.64 |
Person separation (criteria: > 2) | 2.08 | 1.68 | 0.74 | 1.34 |
Separate person strata = [(4 × separation index) + 1] / 3 (criteria: fair, 2–3; good, 3–4; very good, 4–5; excellent, > 5) | 3.11 \(\approx\) 3 levels | 2.57 \(\approx\) 3 levels | 1.32 \(\approx\) 1 level | 2.12 \(\approx\) 2 levels |
Cronbach alpha (criteria: fair 0.67–0.80; good 0.81–0.90; very good 0.91–0.94; excellent > 0.94) | 0.93 | 0.90 | 0.85 | 0.85 |
Dimensionality | ||||
Raw variance in data explained by measures (criteria > 40%) | 40.9% | 45.0% | 53.4% | 57.5% |
Unexplained variance in 1st contrasts of PCA of residuals (criteria: fair, 10–15%; good, 5–10%; very good, 3–5%; excellent, < 3%) | 12.6% | 13.7% | 36.8% | 17.3% |
Rating scale analysis | ||||
Average observed (criteria: increases monotonically across rating scale) | Yes | NA | NA | NA |
Outfit MNSQ (criteria: < 2 logits) | Yes | NA | NA | NA |
Adjacent threshold distance (criteria: 1.4–5 logits) | (i) scale 0–1 was 0 to 0.10 = 0.10 logits; (ii) scale 1–2 was 0.10 to -0.85 = 0.95 logits; (iii) scale 2–3 was -0.85 to 0.56 = 1.41 logits; (iv) scale 3–4 was 0.56 to 0.18 = 0.38 logits | NA | NA | NA |