Table 1.
Physical activity distribution of adults with radiographic knee OA (n=1089)
| DESCRIPTIVE FACTORS | N | Inactive (%) | Low Active (%) | Met Recommendations (%) | Trend test p-value* |
|---|---|---|---|---|---|
| Overall | 1089 | 48.9 | 41.0 | 10.2 | - |
| Age in years: | |||||
| 49–59 | 300 | 33.7 | 54.3 | 12.0 | <.0001 |
| 60–69 | 374 | 42.8 | 45.7 | 11.5 | |
| 70–79 | 415 | 65.3 | 27.0 | 7.7 | |
| Gender: | |||||
| Male | 492 | 39.8 | 47.2 | 13.0 | <.0001 |
| Female | 597 | 56.3 | 35.9 | 7.9 | |
| Race/Ethnicity: | |||||
| White | 911 | 46.9 | 41.3 | 11.9 | <.0001 |
| Non-White | 178 | 59.0 | 39.3 | 1.7 | |
| Live Alone | |||||
| Yes | 236 | 58.1 | 33.1 | 8.9 | 0.0061 |
| No | 853 | 46.3 | 43.1 | 10.6 | |
| Education | |||||
| Post high school | 925 | 45.5 | 43.4 | 11.1 | <.0001 |
| High school or less | 164 | 67.7 | 27.4 | 4.9 | |
| Employed | |||||
| Working | 587 | 40.6 | 47.4 | 12.1 | <.0001 |
| Not working | 464 | 58.6 | 33.0 | 8.4 | |
| Missing/Other | 38 | 57.9 | 39.5 | 2.6 | |
| Chronic Knee pain | |||||
| No | 576 | 46.9 | 40.1 | 13.0 | 0.0114 |
| Yes | 513 | 51.1 | 41.9 | 7.0 | |
| Total knee replacement prior to enrollment | |||||
| No | 1020 | 68.1 | 27.5 | 4.4 | 0.0012 |
| Yes | 69 | 47.6 | 41.9 | 10.6 | |
| Comorbidity | |||||
| Score 0 | 782 | 44.1 | 44.3 | 11.6 | <.0001 |
| 1–2 | 262 | 61.1 | 32.4 | 6.5 | |
| 3 or more | 45 | 60.0 | 33.3 | 6.7 | |
|
| |||||
| MODIFIABLE FACTORS | |||||
| General Health Factors | |||||
| BMI Normal† | 229 | 35.8 | 46.3 | 17.9 | <.0001 |
| Overweight†† | 441 | 44.0 | 43.5 | 12.5 | |
| Obese††† | 419 | 61.1 | 35.3 | 3.6 | |
| Depressive symptoms | |||||
| Not High | 964 | 48.2 | 41.0 | 10.8 | 0.0948 |
| High (CESD≥16) | 125 | 53.6 | 40.8 | 5.6 | |
| Health Behaviors | |||||
| Fat Intake | |||||
| Adequate/Low | 585 | 47.4 | 41.2 | 11.5 | 0.1394 |
| High | 504 | 50.6 | 40.7 | 8.7 | |
| Dietary Fiber Intake | |||||
| Adequate | 227 | 40.5 | 45.4 | 14.1 | 0.0018 |
| Low | 862 | 51.0 | 37.8 | 9.2 | |
| Smoker | |||||
| No | 1027 | 48.7 | 41.2 | 10.1 | 0.8391 |
| Yes/Missing | 62 | 51.6 | 37.1 | 11.3 | |
| Knee-specific Health Factors | |||||
| WOMAC dysfunction‡ | |||||
| None | 337 | 42.1 | 43.9 | 14.0 | <.0001 |
| Moderate (Middle tertile) | 378 | 46.0 | 41.5 | 12.4 | |
| Severe (Top tertile) | 374 | 57.8 | 37.7 | 4.6 | |
| WOMAC knee pain‡‡ | |||||
| None | 342 | 43.3 | 42.7 | 14.0 | <.0001 |
| Moderate (Middle tertile) | 364 | 47.5 | 40.7 | 11.8 | |
| Severe (Top tertile) | 383 | 55.1 | 39.7 | 5.2 | |
| Knee Confidence | |||||
| Not troubled | 510 | 48.8 | 39.6 | 11.6 | 0.2006 |
| Mild/Moderately Troubled | 530 | 47.6 | 43.2 | 9.3 | |
| Severely/extremely Troubled | 49 | 63.3 | 30.6 | 6.1 | |
*
Mantel-Haenszel chi-square test for trend (1 d.f.) except for race, gender, and living arrangement comparisons, which used chi-square test for overall differences;
†
Normal includes 1 person with BMI below the range 18.5–24.9;
††
Overweight BMI 25.0–29.9;
†††
Obese BM ≥ 30;
‡
WOMAC function tertiles based on maximum of left and right knees: low 0.0, middle 1.0–11.2; top tertile ≥ 11.3;
‡‡
WOMAC pain tertiles based on maximum of left and right knees: none, 0<middle<4.0; top (most pain) tertile ≥ 4.0