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To evaluate the applicability of the Job Content Questionnaire (JCQ-22) based on classical test theory (CTT) and item response theory, and to optimize and adjust it.
A survey of 917 occupational groups who had a physical examination at a hospital from September 1 to September 30, 2021 was conducted using JCQ-22, and the entries were comprehensively analyzed using the Rasch model, two-parameter logistic model (2PL), and grade-response model (GRM) in the IRT, combined with Cronbach’s α coefficient within CTT, and the factor analysis method.
In the IRT analysis, the difficulty coefficients of the entries ranged from -2.49 to 0.36, and the difficulty coefficients of “JOB4”, “JOB7”, “JOB10”,“JOB11” had a differentiation degree lower than 1.34, and the corresponding average information content was significantly lower than the other entries. In the CTT analysis, a total of 18 entries met the statistical criteria, therefore, combining the IRT and CTT, the JCQ-22 was optimized and adjusted, and the results showed that the adjusted scale JCQ-18 had 18 entries, which was more concise and had a more stable structure.
Most of the entries of JCQ-22 performed well, while some of the entries did not meet the acceptable standards and need further optimization.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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