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Table 3 Tests of scaling assumptions.

From: Childbirth experience questionnaire (CEQ): development and evaluation of a multidimensional instrument

Scale Item internal consistency Item discriminant validity¤ Item-scale correlation, rp range Item means & variance, M (SD) range¥
  Item-scale correlations# Cronbach's alpha§    
Own capacity 7/8 0.82 8/8 0.30-0.69 1.89-3.25 (0.76-1.03)
Professional support 5/5 0.88 5/5 0.69-0.74 3.64-3.79 (0.52-0.67)
Perceived safety 5/6 0.78 6/6 0.36-0.67 2.99-3.69 (0.52-1.01)
Participation 2/3 0.62 3/3 0.33-0.56 3.35-3.71 (0.60-0.90)
  1. Scaling assumptions:
  2. # Item-hypothesized scale correlations ≥ 0.40, corrected for overlap/number of correlations.
  3. § Scale internal consistency reliability coefficients (Cronbach's alpha).
  4. ¤ Item-hypothesized scale correlation significantly higher or higher than item-other scale.
  5. Item-scale correlations roughly the same for all items in scale.
  6. ¥ Items in hypothesized scale have roughly equal means and variances.