| No. | Name of Lifestyle | Third Class | Second Class | First Class | Type | No. of Studies |
|---|---|---|---|---|---|---|
| 1 | Vitamin C+African Americans | NA | Vitamin C+Racial differences | Joint effect | No statistical significance factor | 1 |
| 2 | Vitamin C+Caucasians | NA | Vitamin C+Racial differences | Joint effect | Reference | 1 |