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Table 4 Item internal consistency (IIC), item discriminant validity (IDV), percentage of missing values (%MV), Cronbach’s alpha (alpha), intra-class correlation coefficient (ICC) of the APAIS dimension scores and global index (mean +/- SD), and inlier-sensitive fit (INFIT)

From: Validation of the French version of the Amsterdam preoperative anxiety and information scale (APAIS)

Dimension/APAIS dimensions Mean ± SD Floor Ceiling MV (%) IIC IDV Alpha INFIT
Anxiety about anaesthesia (2) 3.3 ± 1.8 43.1 1.7 1.7 0.67 0.16-0.61 0.80 0.94-1.09
Anxiety about surgery (2) 3.9 ± 2.3 40.2 2.9 0.6 0.72 0.27-0.61 0.84 0.98-1.01
Desire for information (2) 5.7 ± 2.3 11.5 6.9 2.9 0.61 0.16-0.36 0.76 0.96-1.00
Global anxiety 7.2 ± 3.7 NA NA 5.1 NA NA NA NA
  1. IIC the correlation between the item scores and their dimension score (corrected for overlap). The numbers shown are the lowest and highest Pearson’s correlation coefficients. IDV the correlation between the item scores for a given dimension and the other dimension scores. The numbers shown are the lowest and highest Pearson’s correlation coefficients. NA not applicable.