Age, occupation, job content questionnaire (JCQ) scale scores, other covariates and glycosylated haemoglobin A1c (HbA1c) among 268 employed men aged 40–60 who had no history of diabetes mellitus or other chronic diseases in a manufacturing firm in Japan
| Variable | Mean (SD, range) | n (%) |
|---|---|---|
| Age | 46.6 (5.1, 40–60) | |
| Occupation: | ||
| Managers | 111 (41) | |
| Professional workers | 34 (13) | |
| Technical workers | 39 (15) | |
| Clerks | 42 (16) | |
| Mechanics | 14 (5) | |
| Machine operators | 28 (10) | |
| JCQ scales: | ||
| Psychological job demands | 33.5 (5.6, 12–48) | |
| Job control | 74.0 (11.3, 30–96) | |
| Worksite social support | 22.5 (3.2, 8–32) | |
| Job strain1-150 | 0.92 (0.18, 0.50–1.82) | |
| Covariates: | ||
| Body mass index (kg/m2) | 22.7 (2.5, 16.6–29.8) | |
| Drinks a week (n) | 7.7 (8.1, 0–49) | |
| Cigarettes smoked a day (n) | 9.5 (11.5, 0–60) | |
| Total energy intake (kcal/day) | 2897 (682, 1334–5877) | |
| Leisure time physical exercise (times/month) | 2.0 (3.1, 0–26) | |
| Family history of diabetes mellitus (any first relative) | 28 (10) | |
| HbA1c (%) | 4.86 (0.32, 3.9–5.8) |
↵1-150 Job strain was calculated as a ratio of job demands to job control (job demands score divided by half the job control score).21