Table 7

"Parent-Scales – Scale statistics and reliability
Information Decision making Professional competence Practice organization Practice facilites
"Parent"-Scales
Number of items 6 4 3 4 2
Responder (n) 878 915 693 966 973
Missing values (%) 10.3 6.5 29.2 1.3 0.6
Subscale minimum/maximum 0/18 0/12 0/9 0/12 0/6
Subscale mean, raw 14.6 8.4 7.8 10.2 4.4
Subscales transformed (min/max) 0/100 0/100 0/100 0/100 0/100
Subscale mean, transformed 80.9 70.3 86.4 85.2 73.9
Floor effect (%) 0.2 3.4 0.2 0.2 0.8
Ceiling effect (%) 28.7 29.0 36.4 27.2 34.1
Skewness -.75 -.66 -.64 −1.1 -.53
Inter-item correlation (min/max) 0.67 (0.57 – 0.79) 0.79 (0.75 – 0.83 0.63 (0.50 – 0.69) 0.39 (0.27 – 0.50) 0.78
Cronbach‘s alpha 0.92 0.94 0.84 0.72 0.88

Bitzer et al.

Bitzer et al. BMC Health Services Research 2012 12:347   doi:10.1186/1472-6963-12-347

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