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Table 5 Nuss Questionnaire modified for Adults: construct validity, missing, responses, floor/ceiling effects, and reliability

From: Translation and psychometric evaluation of the Swedish versions of the Nuss Questionnaire modified for Adults and the Single Step Questionnaire

Factor 1 2      
Eigenvalue 5.26 1.55 Missing (%) Floor/Ceilinga (%) Corrected
item-total
correlationb
Cronbach’s αc α if item deleted
Cumulative variance % 49.42 60.88
  Loadings EFA (CFA)
PS    1.8 6.5/51.5   .91  
 2 .72 (.77) .07 2.5 10.2/24.6 .71   .90
 4 .44 (.49) .11 2.1 .4/85.6 .47   .92
 5 .92 (.88) −.02 2.1 5.1/60.2 .85   .89
 6 .91(.90) −.09 1.7 8.9/53.4 .86   .88
 7 .89 (.90) −.00 1.7 7.2/45.8 .86   .88
 8 .94 (.92) −.05 1.3 7.2/54.7 .87   .88
 9 .52 (.59) .12 1.3 5.9/34.7 .55   .92
PH    2.1 4.7/51.0   .77  
 10 .05 .76 (.80) 1.7 4.2/55.9 .58   .71
 11 −.01 .74 (.72) 1.3 6.8/30.1 .60   .69
 12 .03 .70 (.71) 3.4 3.0/64.8 .63   .66
  1. PS psychosocial subscale, PH physical subscale, EFA exploratory factor analysis, CFA confirmatory factor analysis
  2. Items with loadings > .40 were considered to contribute to a factor. a Number of subjects scoring at the lowest or highest possible scale level. b r > .40 was acceptable. c α > .70 indicates valid use for group assessment, α > .90 indicates valid use for individual assessment