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Characteristics of subjects donating normal gingival tissue samples
| Characteristic | Smokers (n=22) | Nonsmokers (n=24) |
|---|---|---|
| Mean age (years) | 51 | 55 |
| Male: female ratio | 1.2:1 | 1.2:1 |
| Ethnicity | 18 Caucasian | 18 Caucasian |
| 4 African American | 6 African American | |
| Mean tobacco exposure (pack-years) | 27.9 | (not applicable) |
