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| No. | Name of Lifestyle | Third Class | Second Class | First Class | Type | No. of Studies |
|---|---|---|---|---|---|---|
| 1 | Age at starting to Smoke of Recent former+current Smokers | NA | Smoke+Age | Joint effect | No statistical significance factor | 1 |
| 2 | Smoke+Age>65 | NA | Smoke+Age | Joint effect | No statistical significance factor | 1 |
| 3 | Smoke+Age≤ 65 | NA | Smoke+Age | Joint effect | Protective factor | 1 |