Table 4. Risk factors associated with the adherence of knee OA patients using logistic regression analysis.
| Variables | Knee OA patients | ||
|---|---|---|---|
| Odds ratio | 95% CI | ||
| Lower | Upper | ||
| Sex (ref. male) | 0.535 | 0.315 | 0.910 |
| Age, yr | |||
| 65-69 | 1.000 | - | - |
| 70-74 | 1.470 | 0.949 | 2.279 |
| 75-79 | 2.066 | 1.225 | 3.483 |
| 80 ≤ | 1.875 | 1.036 | 3.392 |
| Education* | 0.886 | 0.734 | 1.069 |
| Number of NSAID treatment† | 0.989 | 0.726 | 1.348 |
| Duration of knee OA‡ | 0.999 | 0.997 | 1.001 |
| BMI§ | 0.970 | 0.917 | 1.027 |
Abbreviations: OA, osteoarthritis; CI, Confidence interval; NSAIDs, Non-steroidal anti-inflammatory drugs; BMI, Body mass index.
*Reference group, elementary school; †Frequency of daily NSAIDs administration/Reference group, frequency = 1; ‡Reference group, duration (months) of knee OA < 67.0 (mean); §Reference group, BMI < 24.4 (mean).