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% | |
IPAQ International physical activity questionnaire, HEPA Health-enhancing physical activity
aOsteoarthritis expert panel recommendation: Performance of 30 min of moderate-intensity (50–70% maximal heart rate) physical activity or exercise at least 3 days a week