eTable 8. Soccer and the relative risk of knee osteoarthritis (Vrezas et al. [2010]), Seidler et al. [2008]).
|
Overall dose: amount of soccer ever played*1 (median M relates to median exposure in corresponding category among control persons) |
Cases | % | Controls | % | OR1 *2 | [95% CI] | OR2 *3 | [95% CI] |
| No soccer (M: 0 h) |
178 | 60.3 | 208 | 63.6 | 1.0 | – | 1.0 | – |
| > 0 to < 1660 h (M: 1040 h) |
29 | 9.8 | 35 | 10.7 | 1.3 | [0.7; 2.3] | 1.1 | [0.5; 2.1] |
| 1660 to < 4000 h (M: 2652 h) |
41 | 13.9 | 34 | 10.4 | 1.9 | [1.0; 3.4] | 2.0 | [1.0; 3.8] |
| 4000 to < 7800 h (M: 5460 h) |
32 | 10.8 | 19 | 5.8 | 2.2 | [1.1; 4.4] | 2.2 | [1.0; 5.0] |
| ≥ 7800 h (M: 9984 h) |
15 | 5.1 | 16 | 4.9 | 1.2 | [0.5; 2.8] | 1.4 | [0.6; 3.6] |
*1 The overall dose of soccer ever played relates to both amateur and professional soccer. For the cases, the exposure up to the first diagnosis of knee osteoarthritis was included; for the controls, up to the time of questioning for the purposes of the study.
*2 OR 1: Odds ratio adjusted for age and study center
*3 OR 2: Odds ratio adjusted for age, study center, weight (BMI), jogging/athletics, cumulative kneeling, and cumulative lifting/carrying CI, Confidence interval; h, total hours of soccer; OR, odds ratio