9. | Number of working hours per day |
|
|
| a) 8 | 39 | 48.75 |
| b) 10 | 25 | 31.25 |
| c) 12 | 16 | 20 |
| d) >12 | 0 | 0 |
10. | Number of night shifts per week |
|
|
| a) 2 | 40 | 50 |
| b) 3 | 29 | 36.25 |
| c) 4 | 11 | 13.75 |
| d) >4 | 0 | 0 |
11. | Any previous history of illness |
|
|
| a) yes | 39 | 48.75 |
| b) No | 55 | 68.75 |