Table 2.
General characteristics of the selected population according to number of working hours per week
| Characteristics | Number of working hours per week | |||||
|---|---|---|---|---|---|---|
| ≤40 | 41–50 | 51–60 | ≥61 | p | ||
| (n = 476) | (n = 366) | (n = 199) | (n = 165) | |||
| Male, n (%) | 286 (67.9) | 223 (66.2) | 117 (65.7) | 77 (53.8) | 0.022 | |
| Age, years (SD) | 52.1 (5.8) | 52.0 (5.7) | 52.3 (6.6) | 54.1 (7.1) | *0.003 | |
| Education | ||||||
| Elementary school graduation or less | 83 (19.7) | 51 (15.1) | 39 (21.9) | 45 (31.5) | <0.001 | |
| Middle school graduation | 65 (15.4) | 70 (20.8) | 39 (21.9) | 43 (30.1) | ||
| High school graduation | 156 (37.1) | 148 (43.9) | 80 (44.9) | 47 (32.9) | ||
| College graduation or beyond | 117 (27.8) | 68 (20.2) | 80 (11.2) | 8 (5.6) | ||
| Income (won) | ||||||
| ≤990,000 | 134 (31.8) | 76 (22.6) | 41 (23.0) | 61 (42.7) | <0.001 | |
| 1,000,000-1,990,000 | 98 (23.3) | 117 (34.7) | 86 (48.3) | 61 (42.7) | ||
| 2,000,000-2,990,000 | 59 (14.0) | 71 (21.1) | 33 (18.5) | 15 (10.5) | ||
| ≥3,000,000 | 117 (27.8) | 64 (19.0) | 13 (7.3) | 4 (2.8) | ||
| Neglect to answer | 13 (3.1) | 9 (2.7) | 5 (2.8) | 2 (1.4) | ||
| Occupation | ||||||
| Managers, professional and experts | 93 (22.1) | 62 (18.4) | 16 (9.0) | 3 (2.1) | <0.001 | |
| Engineers, semi-experts | 36 (8.6) | 22 (6.5) | 3 (1.7) | 2 (1.4) | ||
| Office workers | 48 (11.4) | 32 (9.5) | 16 (9.0) | 4 (2.8) | ||
| Service and sales workers | 46 (10.9) | 32 (9.5) | 30 (16.9) | 49 (34.3) | ||
| Skilled agricultural, forestry and fisheries workers | 7 (1.7) | 5 (1.6) | 3 (1.7) | 3 (1.7) | ||
| Craft and related trades workers | 39 (9.3) | 50 (14.8) | 33 (18.5) | 9 (6.3) | ||
| Machine operators, assembly workers | 41 (9.7) | 43 (12.8) | 26 (14.6) | 22 (15.4) | ||
| Elementary workers | 111 (26.4) | 91 (27.0) | 51 (28.7) | 51 (35.7) | ||
| Form of employment | ||||||
| Regular | 281 (66.7) | 264 (78.3) | 138 (77.5) | 89 (62.2) | <0.001 | |
| Temporary or part-time | 140 (33.3) | 73 (21.7) | 40 (22.5) | 54 (37.8) | ||
| BMI | ||||||
| kg/m2 (SD) | 23.25 (2.8) | 23.2 (2.5) | 23.0 (2.5) | 23.0 (2.8) | *0.731 | |
| Alcohol habit | ||||||
| Yes, n (%) | 261 (62.0) | 188 (55.8) | 99 (55.6) | 78 (54.5) | 0.208 | |
| Smoking habit | ||||||
| Current smoker, n (%) | 141 (33.5) | 95 (28.2) | 55 (30.9) | 53 (37.1) | 0.215 | |
| Exercise | ||||||
| Less than once a week, n(%) | 212 (50.4) | 200 (59.3) | 130 (73.0) | 104 (72.7) | <0.001 | |
| Working days per week | ||||||
| ≥6 days, n (%) | 40 (9.5) | 230 (68.2) | 159 (89.3) | 111 (77.6) | <0.001 | |
| Self-reported hypertension during follow-up | ||||||
| Yes, n (%) | 24 (5.7) | 31 (9.2) | 14 (7.9) | 16 (11.2) | 0.126 | |
*p-value of Kruskal–Wallis test. Others were calculated by Pearson’s chi-squared test.