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Table 1 Rasch analysis of the psychometric properites of the Sense of Coherence (SOC) subscales, total scale, and reduced scale (N = 428)

From: Psychometric limitations of the 13-item Sense of Coherence Scale assessed by Rasch analysis

Step   Meaningfulness
subscale
(4 items)
(#1, #4, #7, and #12)
Comprehensibility
subscale
(5 items)
(#2, #6, #8, #9, #11)
Manageability
subscale
(4 items)
(#3, #5, #10 and #13)
Total scale
(13 items)
Reduced scale
(11 items)
(#1 and #5 omitted)
1 Items not meeting criteria for rating scale #7 and #12 a None #5b #7 and #12 a; #5 b #7 and #12 a
2 Item misfit None None None #1 and #5 c None
3 Variance explained by1st dimension, % 55.0% 50.1% 47.3% 39.7% 42.8%
 2nd dimension, % 16.1% 14.6% 21.2% 9.6% 8.5%
4 Person misfit, n (%) 15 (3.5%) 19 (4.4%) 20 (4.7%) 40 (9.6%) 29 (6.8%)
 Maximum score, n (%) 19 (4.4%) 7 (1.6%) 12 (2.8%) 2 (0.5%) 2 (0.5%)
 Minimum score, n (%) None None None None None
5 Person-separation index (without extremes) 1.41 1.54 1.18 2.19 2.10
Cronbach alpha 0.67 0.70 0.58 0.83 0.82
6 Differential item functioning (DIF)      
 Age (<40 years vs ≥40 years) No DIF No DIF No DIF   
 Gender (male vs female) No DIF No DIF No DIF   
 Civil status (married/cohabitant vs not) No DIF #6 d No DIF   
 Education (≤12 years vs >12 years) No DIF No DIF No DIF   
 Work (Working/student vs not) No DIF No DIF No DIF   
  1. a#7 and #12: Scale step categories 1 and 2 reversed. After collapsing scale step categories 1 and 2, the rating scale met the criteria set
  2. b#5: Scale step categories 1 to 3 disordered (3,2,1,4,5,6,7). After collapsing scale step categories 1 to 3, the rating scale met criteria set
  3. c#1: Infit MnSq 1.32 StdZ 3.7; #5: Infit MnSq 1.34 StdZ 4.1
  4. dGroup 1: 46.61 Group 2: 44.11 p < .01