Table 3

Test of scaling assumptions
Scale Item internal consistency
Item Item Item
Item-scale Cronbachs Discriminant Correlations Variance, SD
Correlation* alpha** validity range*** range ****
Worry 7/8 0.82 8/8 0.34-0.67 0.78-1.17
Information 4/4 0.73 4/4 0.45-0.57 0.74-0.98
Emotional
support 3/6 0.65 6/6 0.26-0.48 0.92-1.22
Acceptance 4/4 0.66 3/4 0.40-0.49 0.72-0.97

* Item scale correlation > 0.40, corrected for overlap / number of correlations.

** Scale internal consistency reliability (Cronbachs alpha).

*** Item-scale correlations roughly the same for all items in the scale.

**** Item in hypothesized scale have roughly equal variances.

Premberg et al.

Premberg et al. BMC Pregnancy and Childbirth 2012 12:35   doi:10.1186/1471-2393-12-35

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