| Time spent min per week | Month | ||||
| 4 | 6 | 8 | 12 | ||
| Subjects n | 199 | 190 | 193 | 188 | |
| Median min per week | 80 (20–150) | 75 (0–150) | 70 (0–125) | 50 (0–125) | |
| Category# | |||||
| 0 | 0 | 46 (23) | 49 (26) | 65 (34) | 63 (34) |
| 1 | 1–60 | 34 (17) | 30 (16) | 30 (16) | 38 (20) |
| 2 | 61–120 | 49 (25) | 40 (21) | 44 (23) | 38 (20) |
| 3 | 121–180 | 33 (17) | 41 (22) | 32 (17) | 24 (13) |
| 4 | >180 | 37 (19) | 30 (16) | 22 (11) | 25 (13) |
Data are presented as median (interquartile range) or n (%), unless otherwise stated. #: sum of percentage values may not equal 100 due to rounding.