Table 3.
Association of age, BMI, gender, muscle strength and severity of knee OA with knee pain
| Right knee | Left knee | |||||
|---|---|---|---|---|---|---|
| Adjusted OR | 95 % CI | P values | Adjusted OR | 95 % CI | P values | |
| Overall | ||||||
| Age | 1.01 | 0.996–1.02 | 0.1698 | 1.00 | 0.99–1.02 | 0.6107 |
| BMI | 1.09 | 1.06–1.13 | <0.0001 | 1.09 | 1.06–1.13 | <0.0001 |
| Women (vs Men) | 1.34 | 1.03–1.76 | 0.0299 | 1.35 | 1.03–1.78 | 0.0321 |
| Quadriceps muscle strength (5kgf increase) | 0.87 | 0.82–0.92 | <0.0001 | 0.88 | 0.82–0.93 | <0.0001 |
| KL 2 | 1.3 | 0.96–1.75 | 0.0929 | 1.54 | 1.12–2.12 | 0.0083 |
| KL 3 or 4 | 3.77 | 2.79–5.10 | <0.0001 | 4.49 | 3.31–6.10 | <0.0001 |
| Men | ||||||
| Age | 1.01 | 0.99–1.04 | 0.3309 | 1.01 | 0.99–1.04 | 0.3269 |
| BMI | 1.09 | 1.02–1.17 | 0.013 | 1.09 | 1.02–1.18 | 0.0152 |
| Quadriceps muscle strength (5 kgf increase) | 0.85 | 0.76–0.94 | 0.0019 | 0.86 | 0.77–0.96 | 0.0087 |
| KL 2 | 1.06 | 0.54–2.16 | 0.8753 | 1.18 | 0.60–2.21 | 0.624 |
| KL 3 or 4 | 5.98 | 3.42–10.54 | <0.0001 | 4.99 | 2.79–8.93 | <0.0001 |
| Women | ||||||
| Age | 1.01 | 0.99–1.02 | 0.2416 | 1.00 | 9.99–1.02 | 0.945 |
| BMI | 1.09 | 1.05–1.14 | <0.0001 | 1.09 | 1.05–1.14 | <0.0001 |
| Quadriceps muscle strength (5 kgf increase) | 0.88 | 0.82–0.95 | 0.0007 | 0.89 | 0.82–0.96 | 0.003 |
| KL 2 | 1.33 | 0.95–1.89 | 0.1007 | 1.67 | 1.15–2.44 | 0.0068 |
| KL 3 or 4 | 3.24 | 2.28–4.64 | <0.0001 | 3.37 | 3.12–6.44 | <0.0001 |
Adjusted OR was calculated by multiple logistic regression analysis with age, BMI, gender, Quadriceps muscle strength and KL grade as explanatory variables
OR Odds ratio, CI Confidence interval, BMI, Body mass index