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Distribution of the patients according to Outerbridge classification in case and control groups
| Group A | Group B | p | |||
|---|---|---|---|---|---|
| N | % | N | % | ||
| OC | |||||
| Grade 0 | 0 | 0 | 18 | 69.2 | 0.001 |
| Grade 1 | 11 | 45.8 | 6 | 23.1 | |
| Grade 2 | 6 | 25 | 2 | 7.7 | |
| Grade 3 | 5 | 20.8 | 0 | 0 | |
| Grade 4 | 2 | 8.3 | 0 | 0 | |
Group A:case group; Group B:controls; OC: Outerbridge classification; N:number; %:percentage
