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Table 2 Fit statistics for perceived social attitudes measures

From: Development of the German social attitude barriers and facilitators to participation-scales: an analysis according to the Rasch model

Analysis

Item location

Person location

Item-trait interaction

(Overall fit to the model)

 

Reliability (PSI)c

Mean

SD

Mean

SD

X2

df

p-value

Unidimensionalitya

 

Individual Facilitators

Initial

.00

.55

1.17

1.48

122.4

44

.000

%PST = 7.1% (%LB95CI = 4.9%)b

.84

Final

.00

.27

.78

1.28

21.8

16

.146

%PST = 2.6%

.69

 

Individual Barriers

Initial

.00

.86

−2.99

1.62

601.9

108

.000

%PST = 13.3% (%LB95CI = 10.9%)

.89

Final 14 items

.00

.93

−2.67

1.46

58.7

32

.011*

%PST = 2.6%

.78

Final 7 items

.00

.83

−2.86

1.63

26.1

14

.024*

%PST = 1.6%

.69

 

Societal Facilitators

Initial

.00

.41

.52

1.60

84.6

14

.000

%PST = 9.6% (%LB95IC = 7.4%)

.84

Final

.00

.32

.65

2.29

16.3

12

.173

%PST = 3.1%

.87

 

Societal Barriers

Initial

.00

.78

−1.37

2.09

99.0

32

.000

%PST = 7.4% (%LB95IC = 5.2%)

.89

Final

.00

.44

−1.07

1.87

18.3

24

.783

%PST = 7.0% (%LB95IC = 4.7%)b

.88

  1. Notes. *Good fit of the 14 and 7 items to the model with Bonferroni-adjusted p = 0.001; aThe percentage of significant t-test comparisons (%PST) should not exceed 5%; bThe lower bound of the binomial confidence interval (%LB95IC) below 5% is reported to evidence acceptable unidimensionality. cPerson separation index