Table 1 Comparison of the general characteristics and physical activity of knee osteoarthritis patients and the general population aged ≥50 years
|  | Knee osteoarthritis patients (≥50 years of age) (N = 1279) | General population (≥50 years of age) (N = 7917) | P-value | ||
|---|---|---|---|---|---|
n | Weighted % | n | Weighted % | ||
Sex | |||||
 Male | 221 | 16.5% | 3707 | 50.3% | < 0.001 |
 Female | 1058 | 83.5% | 4210 | 49.7% |  |
Age | |||||
 50–59 years | 154 | 15.1% | 3226 | 52.3% | < 0.001 |
 60–69 years | 423 | 33.0% | 2601 | 27.1% |  |
  ≥ 70 years | 702 | 51.8% | 2090 | 20.6% |  |
Monthly household income | |||||
 Low | 677 | 53.1% | 2189 | 25.4% | < 0.001 |
 Moderate to low | 290 | 23.5% | 2053 | 26.2% |  |
 Moderate to high | 157 | 12.9% | 1716 | 23.4% |  |
 High | 136 | 10.6% | 1869 | 25.1% |  |
Education level | |||||
  ≤ Elementary | 1010 | 80.4% | 3402 | 41.4% | < 0.001 |
 Middle school | 152 | 11.3% | 1422 | 19.7% |  |
 High school | 92 | 6.8% | 2033 | 26.5% |  |
  ≥ College | 23 | 1.5% | 1040 | 12.4% |  |
Marital status | |||||
 With spouse | 504 | 42.5% | 1427 | 17.8% | < 0.001 |
 Without spouse | 767 | 57.5% | 6416 | 82.2% |  |
Depressive mood | |||||
 No | 991 | 77.3% | 6752 | 85.1% | < 0.001 |
 Yes | 279 | 22.7% | 1128 | 14.9% |  |
Body mass index | |||||
  > 25 kg/m2 | 500 | 43.7% | 4258 | 61.5% | < 0.001 |
  ≤ 25 kg/m2 | 620 | 56.3% | 2582 | 38.5% |  |
Number of comorbidities | |||||
 0 | 360 | 28.7% | 3141 | 42.6% | < 0.001 |
 1 | 441 | 35.2% | 2574 | 31.7% |  |
 2 | 292 | 22.3% | 1447 | 17.4% |  |
  ≥ 3 | 186 | 13.9% | 755 | 8.3% |  |
Cigarette smoking | |||||
 Nonsmoker | 1168 | 90.6% | 6554 | 79.5% | < 0.001 |
 Smoker | 104 | 9.4% | 1326 | 20.5% |  |
Alcohol consumption | |||||
 Never | 700 | 54.1% | 2957 | 34.2% |  |
 Low | 345 | 27.3% | 2114 | 25.1% | < 0.001 |
 Moderate | 150 | 11.6% | 1574 | 21.0% |  |
 Excessive | 77 | 7.0% | 1232 | 19.7% |  |
IPAQ | |||||
 Inactive | 752 | 61.1% | 4200 | 53.3% | < 0.001 |
 Minimally active | 352 | 25.9% | 2443 | 30.1% |  |
 HEPA active | 166 | 13.0% | 1233 | 16.5% |  |
Muscle-strengthening activity (2–3 days/week) | |||||
 Not met | 1219 | 95.7% | 6793 | 85.4% | < 0.001 |
 Met | 60 | 4.3% | 1124 | 14.6% |  |
Flexibility activity (3–5 days/week) | |||||
 Not met | 1081 | 84.2% | 5870 | 73.8% | < 0.001 |
 Met | 198 | 15.8% | 2047 | 26.2% |  |
Osteoarthritis expert panel recommendationa | |||||
 Not met | 1014 | 81.4% | 6071 | 76.8% | 0.003 |
 Met | 256 | 18.6% | 1804 | 23.2% |  |