Assessing adolescents’ perceived proficiency in critically evaluating nutrition information

Table 2 Individual item fit statistics for the critical nutrition literacy-evaluation (CNL-E) scale (pairwise maximum likelihood estimation using RUMM)

Item	Loc	SE	Thresholds					FitRes	χ² (N = 1395)	p(χ²)
3	− 0.171	0.04	− 3.3	− 1.8	− 0.1	1.7	3.5	−0.48	4.5	0.88
4	−0.099	0.04	−3.1	−2.0	−0.2	1.9	3.4	1.40	6.1	0.73
2	−0.076	0.04	−3.7	−2.0	−0.0	2.0	3.7	−2.14	12.4	0.19
5	0.097	0.04	−2.8	−1.8	−0.2	1.6	3.3	1.24	9.9	0.36
1	0.248	0.04	−2.7	−2.0	−0.3	1.7	3.2	−1.72	9.6	0.39

Note: Items sorted by location order, applying the partial credit parameterization (PCM) of the polytomous unidimensional Rasch model (PCM) was applied, df = 9
Estimates shown are from unidimensional Rasch analysis using RUMM2030 software showing item location point estimate (Loc) with standard error (SE). The p(χ²) reports the probability of observing the χ² value on the given degrees of freedom (df) where df = G-1 and G is the number of proficiency groups applied in the formal test of fit. The thresholds indicate the location of the items along the latent continuum, covering the latent trait from approximately −3.7 to + 3.7 logits. The rounded average of the five thresholds are approximately − 3, − 2, − 0, 2 and 3 logits respectively