| No. | Name of Lifestyle | Third Class | Second Class | First Class | Type | No. of Studies |
|---|---|---|---|---|---|---|
| 1 | Ancestry | NA | Racial differences | Demographic characteristics | Protective factor No statistical significance factor | 1 |
| 2 | Ethnicity | NA | Racial differences | Demographic characteristics | Protective factor Risk factor No statistical significance factor | 1 |
| 3 | Race | NA | Racial differences | Demographic characteristics | Protective factor Risk factor No statistical significance factor | 4 |