Table 1.
General characteristics of the selected population
| Characteristics | n (%) | Number of working hours per week | Overtime workers n (%) | |
|---|---|---|---|---|
| Sex | ||||
| Male | 703(65.2) | 47.37 ± 13.53 | 417(59.3) | |
| Female | 376(34.8) | 48.26 ± 15.41 | 241(64.1) | |
| Age (years) | ||||
| 45–49 | 441(40.9) | 47.23 ± 12.71 | 271(61.5) | |
| 50–54 | 311(28.8) | 47.15 ± 13.46 | 176(56.6) | |
| 55–59 | 174(16.1) | 47.76 ± 14.07 | 109(62.6) | |
| 60–64 | 93(8.6) | 48.94 ± 18.68 | 61(65.6) | |
| ≥65 | 60(5.6) | 51.53 ± 19.73 | 41(68.3) | |
| Education | ||||
| Elementary school graduation or less | 218(20.2) | 48.05 ± 17.40 | 135(61.9) | |
| Middle school graduation | 217(20.1) | 50.41 ± 15.96 | 165(70.0) | |
| High school graduation | 431(39.9) | 48.01 ± 12.82 | 275(63.8) | |
| College graduation or beyond | 213(19.7) | 43.86 ± 10.08 | 96(45.1) | |
| Income (won) | ||||
| ≤990,000 | 312(28.9) | 45.67 ± 17.65 | 178(57.1) | |
| 1,000,000–1,990,000 | 362(33.5) | 50.73 ± 14.35 | 264(72.9) | |
| 2,000,000–2,990,000 | 178(16.5) | 48.11 ± 11.25 | 119(66.9) | |
| ≥3,000,000 | 198(18.4) | 43.26 ± 8.15 | 81(40.9) | |
| Neglect to answer | 29(2.7) | 47.97 ± 11.13 | 16(55.2) | |
| Occupation | ||||
| Managers, professionals and experts | 174(16.1) | 43.17 ± 9.27 | 108(45.6) | |
| Engineers, semi-experts | 63(5.8) | 41.11 ± 10.86 | 27(42.9) | |
| Office workers | 100(9.3) | 45.67 ± 11.16 | 52(52.0) | |
| Service and sales workers | 157(14.6) | 53.36 ± 17.26 | 111(70.7) | |
| Skilled agricultural, forestry and fishery workers | 18(1.7) | 45.39 ± 16.15 | 194(69.0) | |
| Craft and related trades workers | 131(12.1) | 47.43 ± 11.94 | 92(70.2) | |
| Machine operator, assembly workers | 132(12.2) | 49.80 ± 13.93 | 91(63.5) | |
| Elementary workers | 304(28.2) | 48.68 ± 15.80 | 193(63.5) | |
| Form of employment | ||||
| Regular | 772(71.5) | 48.56 ± 12.78 | 491(63.6) | |
| Temporary or part-time | 307(28.5) | 45.46 ± 17.13 | 167(54.4) | |
| BMI (kg/m 2 ) | ||||
| <25 | 870(80.6) | 47.63 ± 13.76 | 538(61.8) | |
| ≥25 | 209(19.4) | 47.89 ± 15.99 | 120(57.4) | |
| Alcohol habit | ||||
| No | 453(42.0) | 48.35 ± 14.61 | 293(64.7) | |
| Yes | 687(57.2) | 47.20 ± 13.91 | 365(58.3) | |
| Smoking habit | ||||
| Past or nonsmoker | 735(68.1) | 47.67 ± 14.73 | 455(61.9) | |
| Current smoker | 344(31.9) | 47.69 ± 15.20 | 203(59.0) | |
| Regular Exercise | ||||
| Once a week or more | 433(40.1) | 45.14 ± 13.34 | 224(51.7) | |
| Less than once a week | 646(59.9) | 49.38 ± 14.53 | 434(67.2) | |
| Working days per week | ||||
| ≤5 days | 539(50.0) | 40.92 ± 13.15 | 158(29.3) | |
| ≥6 days | 540(50.0) | 54.43 ± 11.84 | 500(92.6) | |
| Self-reported hypertension during follow-up | ||||
| None | 994(92.1) | 47.45 ± 14.00 | 597(60.1) | |
| Hypertension | 85(7.9) | 50.38 ± 16.30 | 61(71.8) | |
| Total | 1079(100.0) | 47.68 ± 14.21 | 658(61.0) | |