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Table 3 Fit statistics and Cronbach’s alpha of the dimensions of the COS-CRC

From: Consequences of screening in colorectal cancer (COS-CRC): development and dimensionality of a questionnaire

Dimensions (number of items) CLR-χ2(a) Degrees of freedom P Cronbach’s alpha
Part I
Sense of dejection (6) 33.1 17 0.011 0.923
Anxiety (7) 16.9 20 0.661 0.920
Behaviour (7) 15.7 20 0.736 0.905
Sleep (4) 15.1 11 0.178 0.894
Introvert (5) 37.5 17 0.003* 0.886
Introvert (4) after deletion of item 26 6.3 14 0.959 0.876
Change in body perception (3) 2.4 8 0.965 0.900
Fear & Powerlessness (4) 5.0 11 0.933 0.892
Change in perception of own age (2) 0.5 5 0.994 0.788
Emotional reactions (3) 10.1 8 0.260 0.797
Emotional reactions (2) after deletion of item 41 0.0 4 1.000 0.873
Emotional reactions with item 41 split for diagnosis 17.1 22 0.757 0.797
Life-style changes (2) 0.4 5 0.996 0.741
Sexuality (2) 31.6 5 0.000* 0.906
Part Ix
Perceived burden of bowel preparation (7) 18.3 20 0.564 0.886
Perceived burden of bowel preparation (6) after deletion of item 53 19.6 17 0.295 0.891
Knowledge of having colorectal polyps (2) 1.8 5 0.879 0.890
Negative colonoscopy experiences (9) 30.6 26 0.245 0.896
Negative physical colonoscopy experiences (3) 3.9 8 0.867 0.892
Negative emotional colonoscopy experiences (5) 13.3 14 0.502 0.918
Part II
Social relations (3) 0.8 5 0.978 0.808
Relaxed/calm (3) 0.0 5 1.000 0.733
Impulsivity (6) 5.0 11 0.934 0.887
Existential values (6) 6.4 11 0.846 0.863
Existential values (5) after deletion of item 11 18.3 9 0.032 0.851
Existential values (6) with item 11 split for age 11.0 15 0.750 0.863
Existential values (6) super item 10 and 11 7.5 14 0.914 0.863
Empathy (3) 12.4 5 0.029 0.833
  1. aCLR-χ2: Andersen’s conditional likelihood ratio test
  2. *Benjamini–Hochberg rejects all p-values less than 0.0037 to control the FDR at 0.05