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Journal of Patient-Reported Outcomes

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
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