Table 2.
Prevalence of knee OA according to two different definitions
| Prevalence of knee OA based on a combination of KL grades | ||||||
| Combination of KL grades | Group, n |
Total Population a |
||||
| Healthy | Early OA | Late OA | ||||
| Total | Mild | Severe | ||||
| 0:0 | 38 | 38 | – | – | – | 76 |
| 1:0 | – | 4 | – | – | – | 4 |
| 1:1 | – | 2 | – | – | – | 2 |
| 2:0 | – | – | – | – | – | 0 |
| 2:1 | – | – | 1 | 1 | – | 1 |
| 2:2 | – | – | 34 | 34 | – | 34 |
| 3:0 | – | – | 0 | – | – | 0 |
| 3:1 | – | – | 10 | – | 10 | 10 |
| 3:2 | – | – | 10 | – | 10 | 10 |
| 3:3 | – | – | 63 | – | 63 | 63 |
| 4:0 | – | – | 0 | – | 0 | 0 |
| 4:1 | – | – | 3 | – | 3 | 3 |
| 4:2 | – | – | 1 | – | 1 | 1 |
| 4:3 | – | – | 4 | – | 4 | 4 |
| 4:4 | – | – | 4 | – | 4 | 4 |
| Total | 38 | 44 | 130 | 35 | 95 | 212 |
| Prevalence of knee OA based on the mean of KL grades | ||||||
| Mean of KL grades | Group, n |
Total Population a |
||||
| Healthy | Early OA | Late OA | ||||
| Total | Mild | Severe | ||||
| 0.0 | 38 | 38 | – | – | – | 76 |
| 0.5 | – | 4 | – | – | – | 4 |
| 1.0 | – | 2 | – | – | – | 2 |
| 1.5 | – | – | 1 | 1 | – | 1 |
| 2.0 | – | – | 44 | 34 | 10 | 44 |
| 2.5 | – | – | 13 | – | 13 | 13 |
| 3.0 | – | – | 64 | – | 64 | 64 |
| 3.5 | – | – | 4 | – | 4 | 4 |
| 4.0 | – | – | 4 | – | 4 | 4 |
| Total | 38 | 44 | 130 | 35 | 95 | 212 |
aTotal population = health individuals + patients with early OA + total number of patients with late OA