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 |