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Journal of Patient-Reported Outcomes

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
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