Table 4.
Patient characteristics of participants and non-participants
| all participants in cohort | participants in sample | non-participants in sample | comparison# of participation rates | ||||
| N |
n (%) |
N |
n (%) |
N |
n (%) |
OR (95% CI) |
|
| gender (nwomen) | 1045 | 494 (47%) |
130 | 64 (49%) |
180 | 83 (46%) |
1.20 (0.78–1.85) |
| age (n>35 years) | 1045 | 741 (71%) |
130 | 94 (72%) |
180 | 109 (61%) |
1.79 (1.12–2.86)* |
| in men | 551 | 380 (69%) |
66 | 46 (69%) |
97 | 50 (52%) |
2.08 (1.11–3.93)* |
| in women | 494 | 361 (73%) |
64 | 48 (78%) |
83 | 59 (71%) |
1.41 (0.69–2.90) |
| in traumatic | 197 | 134 (68%) |
16 | 11 (73%) |
34 | 17 (50%) |
2.60 (0.80–8.98) |
| in non-traumatic | 848 | 607 (72%) |
114 | 83 (73%) |
146 | 92 (63%) |
1.63 (0.98–2.72) |
| trauma$ (npositive) | 1045 | 197 (19%) |
130 | 16 (12%) |
180 | 34 (19%) |
0.59 (0.32–1.09) |
| in men | 551 | 109 (20%) |
66 | 9 (14%) |
97 | 20 (21%) |
0.60 (0.26–1.38) |
| in women | 494 | 88 (18%) |
64 | 7 (11%) |
83 | 14 (17%) |
0.58 (0.23–1.47) |
| ICPC codes | |||||||
| L15: unspecified | 519 (51%) |
69 (53%) |
82 (46%) |
||||
| L78: acute distortion | 107 (10%) |
7 (5%) |
20 (11%) |
||||
| L90: osteoarthritis | 77 (7%) |
9 (7%) |
28 (16%) |
||||
| L94.2: Osgood-Schlatter | 10 (1%) |
1 (1%) |
0 0% | ||||
| L96: acute meniscus/ligament ruptures | 87 (8%) |
12 (9%) |
14 (8%) |
||||
| L97: chronic internal trauma | 245 (23%) |
32 (25%) |
36 (20%) |
||||
$ patient described onset of complaints in questionnaire as immediate, due to impact or twisting, maximally 1 year before consultation
# comparing participation rates of age groups and traumatic injuries in sample
* p-value < 0.05
N total number of patients
n number of patients in a subset