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

Table 3 Tests of scaling assumptions.

Scale	Item internal consistency		Item discriminant validity^¤	Item-scale correlation, r_p 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)

Scaling assumptions:
^# Item-hypothesized scale correlations ≥ 0.40, corrected for overlap/number of correlations.
^§ Scale internal consistency reliability coefficients (Cronbach's alpha).
^¤ Item-hypothesized scale correlation significantly higher or higher than item-other scale.
^∂ Item-scale correlations roughly the same for all items in scale.
^¥ Items in hypothesized scale have roughly equal means and variances.

ISSN: 1471-2393