Table 2

Odds risk ratio of self-reported knee complaints in 1994/95 and 2005 among 81 floor layers presently working in the trade in 1994/95 relative to graphic designers
Knee complaints
 Employment in the trade in year 2005
 Knee complaints 1995
Knee complaints 2005




N
n (%)
ORcrude
 95% CI ‡
 ORadj†
 95% CI‡
 n (%)
ORcrude
 95% CI‡
 ORadj†
 95% CI ‡

Presently at work











- Floor layers
 56
 39 (69.6%)
 8.5
 3.8–18.7
 9.2
 3.8–22.2
 32 (56.1%)
 2.2
 1.1–4.5
 2.7
 1.2–5.8

- Graphic designers
 75
 16 (21.3%)
 1
 -
 1
 -
 28 (36.8%)
 1
 -
 1
 -
During the past 12 months
 Presently off work *











- Floor layers
 16
 10 (62.5%)
 5.1
 1.6–16.3
 7.7
 2.1–28.9
 7 (43.8%)
 1.9
 0.6–5.9
 2.7
 0.8–8.9

- Graphic designers
 66
 16 (24.2%)
 1
 -
 1
 -
 19 (28.8%)
 1
 -
 1
 -

Change of occupation











- Floor layers
 9
 8 (88.9%)
 27.4
 2.9–258.4
 26.9
 2.7–265.0
 7 (70.0%)
 7.7
 1.4–43.9
 11.7
 1.1–124.8

- Graphic designers
 32
 7 (21.9%)
 1
 -
 1
 -
 10 (31.3%)
 1
 -
 1
 -

Presently at work











- Floor layers
 56
 23 (41.1%)
 5.8
 2.3–14.2
 5.5
 2.2–13.9
 15 (26.3%)
 1.3
 0.6–.2.9
 1.4
 0.6–3.3

- Graphic designers
 75
 8 (10.7%)
 1
 -
 1
 -
 17 (20.7%)
 1
 -
 1
 -
Daily or > 30 days during the past 12 months
 Presently off work *











- Floor layers
 16
 8 (50.0%)
 7.1
 2.1–24.3
 9.1
 2.4–34.4
 5 (29.0%)
 2.6
 0.7–8.9
 3.8
 1.0–15.0

- Graphic designers
 66
 8 (12.1%)
 1
 -
 1
 -
 10 (16.7%)
 1
 -
 1
 -

Change of occupation











- Floor layers
 9
 5 (55.6%)
 11.7
 2.0–68.8
 15.3
 2.1–113.4
 5 (50.0%)
 8.8
 1.6–47.0
 13.8
 1.7–115.1

- Graphic designers
 32
 3 (9.4%)
 1
 -
 1
 -
 4 (12.5%)
 1
 -
 1
 -

* Off work due to early retirement, old – age pension, disability pension, rehabilitation or long illness

† OR, odds risk ratio adjusted for seniority, body mass index & earlier knee injuries

‡ CI, confidence interval

Rytter et al. BMC Musculoskeletal Disorders 2007 8:93   doi:10.1186/1471-2474-8-93