Table 1 Summary of Rasch measurement model on the PedsQL™ 3.0 Neuromuscular Module Indonesian Version parent proxy-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 = 0.48 | 0.0, SD = 0.54 | 0.0, SD = 0.23 | 0.0, SD = 0.53 |
Item reliability (criteria: good 0.81–0.90; very good 0.91–0.94; excellent > 0.94) | 0.93 | 0.94 | 0.15 | 0.90 |
Item separation (criteria: > 3) | 3.61 | 3.99 | 0.42 | 3.07 |
Item strata separated = [(4 × separation index) + 1] / 3 (criteria: fair, 2–3; good, 3–4; very good, 4–5; excellent, > 5) | 5.15 \(\approx\) 5 levels | 5.65 \(\approx\) 5 levels | 0.89 \(\approx\) 1 level | 4.43 \(\approx\) 4 levels |
Item misfit MNSQ range extremes (criteria: good 0.5–2.0; very good 0.7–1.4; excellent 0.77–1.3) | Infit: 0.68–1.41 Outfit: 0.51–1.81 | Infit: 0.66–1.31 Outfit: 0.53–1.68 | Infit: 0.66–1.49 Outfit: 0.63–1.35 | Infit:0.72–1.45 Outfit: 0.72–1.35 |
Point measure correlation (criteria: 0.4–0.85) | 0.36–0.76 | 0.36–0.81 | 0.89–0.93 | 0.75–0.85 |
Model fit: summary of persons | ||||
Person mean in logits (criteria: 0.0 logits) | -1.13, SD = 1.31 | -1.18, SD = 1.25 | -1.63, SD = 2.42 | -0.77, SD = 1.49 |
Person reliability (criteria: good 0.81–0.90; very good 0.91–0.94; excellent > 0.94) | 0.84 | 0.80 | 0.63 | 0.77 |
Person separation (criteria: > 2) | 2.32 | 1.99 | 1.31 | 1.84 |
Person strata separated = [(4 × separation index) + 1] / 3 (criteria: fair, 2–3; good, 3–4; very good, 4–5; excellent, > 5) | 3.43 \(\approx\) 4 levels | 2.99 \(\approx\) 3 levels | 2.08 \(\approx\) 2 levels | 2.67 \(\approx\) 3 levels |
Cronbach alpha (criteria: fair 0.67–0.80; good 0.81–0.90; very good 0.91–0.94; excellent > 0.94) | 0.95 | 0.93 | 0.91 | 0.87 |
Dimensionality | ||||
Raw variance in data explained by measures (criteria > 40%) | 51.9% | 55.6% | 55.6% | 63.4% |
Unexplained variance in 1st contrasts of PCA of residuals (criteria: fair, 10–15%; good, 5–10%; very good, 3–5%; excellent, < 3%) | 8.4% | 10.0% | 29.6% | 11.9% |
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 -0.09 = 0.09 logits; (ii) scale 1–2 was -0.09 to -0.79 = 0.70 logits; (iii) scale 2–3 was -0.79 to 0.71 = 1.50 logits; (iv) scale 3–4 was 0.71 to 0.17 = 0.54 logits | NA | NA | NA |