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Characteristics of study participants by age category
| Characteristics | All participants | Age category | ||
|---|---|---|---|---|
| < 30 (n = 13) | 30–40 (n = 19) | > 40 (n = 19) | ||
| BMI (kg/m 2 ) | ||||
| Underweight (< 18.5) | 0 | 0 | 0 | 0 |
| Normal (18.5–24.9) | 26 | 6 | 8 | 12 |
| Overweight (25-29.9) | 20 | 5 | 9 | 6 |
| Obese (≥ 30) | 5 | 2 | 2 | 1 |
| Education | ||||
| High school and lower | 14 | 4 | 4 | 6 |
| Undergraduate and higher | 37 | 9 | 15 | 13 |
| Smoking status | ||||
| Non-smoker | 33 | 8 | 12 | 13 |
| Smoker | 18 | 5 | 7 | 6 |
| Abstinence period (days) | ||||
| 2–3 | 19 | 4 | 8 | 7 |
| 4–5 | 22 | 6 | 8 | 8 |
| 6–7 | 10 | 3 | 3 | 4 |
