01 August 2020: Clinical Research
Effects of Occupational Stress and Circadian CLOCK Gene Polymorphism on Sleep Quality of Oil Workers in Xinjiang, China
Li Ning 1BCDEF* , Lingyun Shi 2BCDEF* , Ning Tao 1BC , Rong Li 1BC , Ting Jiang 1BC , Jiwen Liu 1ABEG*DOI: 10.12659/MSM.924202
Med Sci Monit 2020; 26:e924202
Table 5 Demographic characteristics of 2116 oil workers.
| Items | Cases | Ratio (%) | |
|---|---|---|---|
| Sex | Male | 1020 | 48.20 |
| Female | 1096 | 51.80 | |
| Age | ≤30 years old | 385 | 18.19 |
| 30~45 years old | 1122 | 53.02 | |
| >45 years old | 609 | 28.78 | |
| Ethnic group | Han | 1560 | 73.72 |
| Minority | 556 | 26.28 | |
| Length of service | ≤15 years | 765 | 36.15 |
| >15 years | 1351 | 63.85 | |
| Work type | Oil production | 253 | 11.96 |
| Oil delivery | 737 | 34.83 | |
| Stoker | 1126 | 53.21 | |
| Work shifts | Fixed day shift | 775 | 36.63 |
| Regular shift | 1180 | 55.77 | |
| Irregular shift | 161 | 7.61 | |
| Professional titles | Medium grade and below | 1208 | 57.09 |
| Senior | 908 | 42.91 | |
| Education | Below junior college | 786 | 37.15 |
| Junior college and above | 1330 | 62.85 | |
| Marriage status | Unmarried | 275 | 13.00 |
| Married | 1841 | 87.00 | |
| Income | ≤3,500 | 733 | 34.64 |
| >3,500 | 1383 | 65.36 | |
| Smoking | Yes | 722 | 34.12 |
| No | 1394 | 65.88 | |
| Drinking | Yes | 1112 | 52.55 |
| No | 1004 | 47.45 |