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Table 4 Confirmatory factor analysis; Goodness-of-fit indices for Nuss Questionnaire modified for Adults and Single Step Questionnaire

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

Fit indices NQ-mA,
2 factors
NQ-mA,
2 factors
NQ-mA,
2 factors
SSQ,
1 factor
SSQ,
3 factors
SSQ,
3 factors
Number of items 12 11 10 14 12 10
Items excluded 3 1, 3 13 6, 10, 13 3, 6, 10, 12, 13
Chi-square/df 4.59 3.2 2.25 7.14 5.38 3.4
RMSEA (90% CI) .13 (.11–.15) .10 (.08–.12) .08 (.05–.10) .17 (.15–.18) .14 (.12–.16) .10 (.08–.12)
SRMR .05 .05 .04 .11 .09 .06
GFI .83 .90 .93 .72 .84 .91
CFI .90 .94 .97 .66 .84 .93
TLI .87 .92 .96 .60 .79 .91
  1. Reference values for acceptable fit: Chi-square/df < 3, RMSEA < .10, SRMR < .08 and GFI, CFI, TLI > .90
  2. CFA confirmatory factor analysis, df degrees of freedom, RMSEA root mean square error of approximation, CI confidence interval, SRMR standardized root mean square error, GFI goodness of fit index, CFI comparative fit index, TLI Tucker Lewis index