The number of subjects and person-years studied according to type of job schedule at year of entry to the study
| Increase by | Job schedule type at entry year | No of subjects whose total cholesterol increased (n (%)) | Total person-years of observation | Incidence rate per 1000 person-years | Mean observed years per person |
| ⩾20% | Day | 1398 (34.3) | 25060 | 55.8 | 6.1 |
| Shift | 1160 (41.3) | 19488 | 59.5 | 6.9 | |
| Total | 2558 (37.1) | 44548 | 57.4 | 6.5 | |
| ⩾25% | Day | 931 (22.8) | 27542 | 33.8 | 6.8 |
| Shift | 802 (28.6) | 21920 | 36.6 | 7.8 | |
| Total | 1733 (25.2) | 49462 | 35.0 | 7.2 | |
| ⩾30% | Day | 602 (14.8) | 29353 | 20.5 | 7.2 |
| Shift | 523 (18.6) | 23645 | 22.1 | 8.4 | |
| Total | 1125 (16.3) | 52998 | 21.2 | 7.7 | |
| ⩾35% | Day | 366 (9.0) | 30468 | 12.0 | 7.5 |
| Shift | 340 (12.1) | 24666 | 13.8 | 8.8 | |
| Total | 706 (10.3) | 55134 | 12.8 | 8.0 | |
| ⩾40% | Day | 226 (5.5) | 31030 | 7.3 | 7.6 |
| Shift | 212 (7.6) | 25298 | 8.4 | 9.0 | |
| Total | 438 (6.4) | 56328 | 7.8 | 8.2 | |
| ⩾45% | Day | 145 (3.6) | 31347 | 4.6 | 7.7 |
| Shift | 131 (4.7) | 25688 | 5.1 | 9.2 | |
| Total | 276 (4.0) | 57035 | 4.8 | 8.3 |