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. Author manuscript; available in PMC: 2023 Mar 14.
Published in final edited form as: JAACAP Open. 2023 Mar 14;1(1):48–59. doi: 10.1016/j.jaacop.2023.03.003

TABLE 3.

Internal Consistency and Structure of the Coronavirus Impact Scale

CHCO JHMI EC/CT NIMH PREDICT
Raw αa 0.75 0.64 0.70 0.74 0.73
Standardized βb 0.67 0.51 0.63 0.65 0.70
Cluster analysis
 Optimal no. of clustersc 1 1 1 1 1
 VSS fitd 0.94 0.91 0.91 0.90 0.96
Item loadingse
 1. Routines 0.60 0.62 0.43 0.65 0.68
 2. Income 0.52 0.48 0.55 0.38 0.47
 3. Food 0.68 0.55 0.79 0.53 0.60
 4. Medical access 0.76 0.60 0.56 0.54 0.57
 5. Psych access 0.61 0.38 0.45 0.56 0.60
 6. Support 0.61 0.48 0.51 0.67 0.47
 7. Personal stress 0.61 0.65 0.73 0.85 0.74
 8. Family stress 0.43 0.27 0.46 0.61 0.53

Note: CHCO = Children’s Hospital Colorado; EC/CT = Early Connections/Conexiones Tempranas; JHMI = Johns Hopkins Medical Institute; NIMH = National Institute of Mental Health; PREDICT = Prospective Research on Early Determinants of Illness and Children’s Health Trajectories; VSS = very simple structure.

a

Raw Cronbach α estimates reliability, or the expected correlation between the Coronavirus Impact Scale and a test just like it in an identical sample. Raw values are calculations based on ordinal values converted to integers.

b

Standardized Revelle β, or minimum split half correlation, represents the proportion of variance in responses that are attributable to a common, that is, general, factor across items. Standardized values are derived from polychoric correlations.

c

The number of clusters optimized on both α and β. Here the optimized number of clusters is one across samples, suggesting a unidimensional scale across samples.

d

Very simple structure (VSS) fit metric used by Revelle for iclust; 0 is poor and 1 is perfect.

e

These loadings may be interpreted as the loadings onto a single factor solution in factor analysis.