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Table 5 Summary of Rasch analysis on WDEQ subscales

From: Assessment of the dimensionality of the Wijma delivery expectancy/experience questionnaire using factor analysis and Rasch analysis

Subscale Analysis Overall model fit Item fit residual mean (SD) Person fit residual mean (SD) PSI % sig t-testsa
All 33 WDEQ items 1 Chisq = 1377.67, df = 297, p < .0001 1.4 (4.61) -0.81 (1.77) .95 23.3% CI:21.7–24.9
Lack of positive emotions (12 items) 2 Chisq = 164.94, df = 108, p < .0001 .41 (2.22) -.44 (1.43) .92 9.09% CI:7.5–10.7
Lack of positive emotions (8 items)
Remove items 1 22 4 14
3 Chisq = 88.43, df = 72, p = .09 .66 (.98) -.43 (1.30) .89 9.97% CI: 8.3–11.6
Lack of positive emotions (5 items)
Remove items 1 22 4 14 13 10 16
4 Chi sq= 74.16, df = 48, p = .004 .26 (1.05) -.38 (1.06) .82 4.84%a
Negative emotions (8 items) 5 Chisq = 198.75, df = 71, p < .0001 .46 (3.31) -3.8 (1.31) .85 10.4% CI: 8.8–12.0
Negative emotions (5 items)
Remove items 24 25 27
6 Chisq = 63.38, df = 45, p = .04 .20 (1.93) -.59 (1.38) .84 5.28% CI: 3.6–6.9
Moment of birth (3 items) 7 Chisq = 45.42, df = 15, p < .0001 .14 (1.30) -.66 (1.19) .59 b
Social isolation (4 items) 8 Chisq = 42.91, df = 20. p = .002 .11 (1.20) -.55 (1.19) .43 b
  1. Chisq Chi square, CI confidence interval, df degrees of freedom, p probability, PSI Person Separation Index, SD standard deviation
  2. aconfidence interval only reportedx if the % value exceeds 5%
  3. bunidimensionality testing not conducted due to small number of items
  4. Note. Overall fit to the model is indicated by a chi square p value that is not significant, Item fit residual SD values and Person ft residual SD values should be less than 1.5, and the percentage of significant t = tests shold not exceed 5%