| No. | Name of Lifestyle | Third Class | Second Class | First Class | Type | No. of Studies |
|---|---|---|---|---|---|---|
| 1 | Age at circumcision | Circumcision | Surgery | Clinical characteristics | Protective factor No statistical significance factor | 1 |
| 2 | Circumcision status | Circumcision | Surgery | Clinical characteristics | No statistical significance factor | 1 |