Table 1 Descriptive information on MPI-S subgroups at baseline
| Â | MPI-S study group | |||
|---|---|---|---|---|
| Â | ID | DYS | AC | Total |
| Â | n = 40 | n = 21 | n = 65 | n = 126 |
Gender | Â | Â | Â | Â |
   Men | 35 (87.5) | 15 (71.4) | 62 (95.4) | 112 (88.9) |
Age, mean (SD) | 40.9 (9.6) | 45.7 (9.3) | 40.6 (9.1) | 41.5 (9.4) |
Marital status | Â | Â | Â | Â |
   Single, living alone or with children | 6 (15) | 2 (9.5) | 3 (4.6) | 11 (8.7) |
   Co-habiting with other adult | 10 (25) | 5 (23.8) | 21 (32.3) | 36 (28.6) |
   Co-habiting with other adult and children | 24 (60) | 14 (66.7) | 41 (63.1) | 79 (62.7) |
Education | Â | Â | Â | Â |
   Compulsory school | 14 (35.0) | 8 (40.0) | 26 (40.0) | 48 (38.1) |
   High school | 24 (60.0) | 12 (60.0) | 35 (53.8) | 71 (56.3) |
   Post high school | 2 (5.0) | - | 4 (6.2) | 6 (4.8) |
Employment grade | Â | Â | Â | Â |
   Blue collar | 38 (95.0) | 20 (95.2) | 60 (92.3) | 118 (93.7) |
   White collar | 2 (5.0) | 1 (4.8) | 5 (7.7) | 8 (6.3) |
Heavy lifting (>10 kg) | Â | Â | Â | Â |
   Almost never | 16 (40) | 7 (33.3) | 21 (32.3) | 44 (35.2) |
   1-5 times/day | 13 (32.5) | 6 (28.6) | 24 (36.9) | 43 (34.4) |
   6-10 times/day | 2 (5) | 1 (4.8) | 5 (7.7) | 8 (6.4) |
   >10 times/day | 8 (20) | 7 (33.3) | 15 (23.1) | 30 (24) |
Working with arms above shoulders | Â | Â | Â | Â |
   Almost never | 18 (45) | 3 (14.3) | 31 (48.4) | 52 (41.3) |
   5-30 min/day | 15 (37.5) | 20 (30.8) | 20 (31.3) | 41 (32.5) |
   31-60 min/day | 2 (5) | 5 (23.8) | 4 (6.2) | 11 (8.7) |
   >60 min/day | 5 (12.5) | 7 (33.3) | 9 (14.1) | 21 (16.7) |
Smoking | Â | Â | Â | Â |
   Yes | 3 (7.5) | 6 (30) | 10 (15.9) | 19 (15.5) |
   No, stopped less than 12 months ago | 1 (2.5) | - | - | 1 (0.8) |
   No, stopped more than 12 months ago | 15 (37.5) | 10 (50) | 17 (27) | 42 (34.1) |
   No, never been a smoker | 21 (52.5) | 4 (20) | 36 (57.1) | 61 (49.6) |