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Table 2 Fit statistics and reliability (Cronbach’s alpha) of the dimensions of the COS-AAA

From: Consequences of screening in abdominal aortic aneurysm: development and dimensionality of a questionnaire

Dimensions (Number of items) CLR-χ2 Degrees of freedom P Cronbach’s alpha
Anxiety (7) 21.71 16 0.1528 0.789
Behavioural (7) 24.54 19 0.1761 0.804
Behavioural (6) minus item 9 10.00 16 0,8667 0.804
Sense of dejection (6) 37.24 16 0.0019d 0.830
Sense of dejection (6)c 24.24 26 0.5622 0.830
Sleep (4) 51.19 11 < 0.0001d 0.807
Sleep (3), minus item 23 6.55 8 0.5853 0.840
Uncertainty about the result of the ultra sound examination (3)b 10.13 7 0.1812 0.343
Change in body perception (8) 21.45 19 0.3124 0.838
Guilt (2)b 0.00 4 1.0000 0.594
Fear and powerlessness (7) 6.30 19 0.9971 0.849
Negative experiences from the examination (2) 4.93 4 0.2948 0.592
Emotional reactions (3) 2.38 6 0.8820 0.790
Change in lifestyle (2) 0 5 1.0000 0.600
Better not knowing (2)b 1.22 4 0.8753 0.704
Fear of rupture (4) 7.08 9 0.6286 0.779
Sexuality (3)b 1.8 8 0.9865 0.820
Information (3)b 24.77 8 0.0017d 0.595
Information (2), minus item 65 0 3 1.0000 0.937
Stigmatised (4)a 5.23 11 0.9193 0.873
Self-blame for smoking (3)a 5.24 8 0.7312 0.914
Still regretful smoking (6)a 4.92 5 0.4262 0.890
Existential values (6) 24.66 10 0.0061d 0.832
Relaxed/calm (3), item 3 possess DIF in relation to diagnosis 3.11 5 0.6831 0.727
Relaxed/calm (2), minus item 3 1.65 3 0.6474 0.716
Social network (3) 8.80 4 0.0662 0.766
Impulsivity (6) 4.83 11 0.9389 0.830
Empathy (3) 6.31 5 0.2776 0.619
  1. aScales only relevant to former and current smokers
  2. bOnly for those men diagnosed with screening-detected AAA
  3. cGraphical log-linear Rasch model where two super items were included: item 1 & item 9 and item 1 & item 15
  4. dMisfit after a correction by the Benjamini-Hochberg procedure [38]