Table 2.
Age-standardized characteristics by relative telomere length quartiles among all subjects
| Characteristic |
Quartile 1 | Quartile 2 | Quartile 3 | Quartile 4 | p-values |
|---|---|---|---|---|---|
| Age (mean) | 59.2 | 58.7 | 58.0 | 57.7 | <0.01 |
| Packyears (ever smokers) | 24.3 | 22.2 | 22.0 | 23.4 | 0.27 |
| Packyears (past smokers) | 19.3 | 16.2 | 16.9 | 17.0 | 0.09 |
| Cigarettes/day (ever smokers)* | 2.78 | 2.78 | 2.72 | 2.67 | 0.21 |
| Cigarettes/day (past smokers)* | 2.78 | 2.71 | 2.64 | 2.59 | 0.12 |
| PMH duration (years) | 4.28 | 3.63 | 4.03 | 3.51 | 0.07 |
| BMI (kg/m2) | 25.3 | 25.6 | 25.3 | 25.5 | 0.33 |
| Weight gain since 18 (kg) | 11.3 | 11.4 | 11.2 | 11.5 | 0.49 |
| Age at menarche | 12.5 | 12.5 | 12.6 | 12.6 | 0.57 |
| Age at first birth | 25.1 | 25.4 | 25.3 | 25.3 | 0.40 |
| Parity | 3.10 | 2.99 | 3.02 | 3.02 | 0.59 |
| Age at menopause | 49.7 | 49.9 | 49.6 | 49.6 | 0.37 |
| Family history of breast cancer (%) | 20 | 18 | 23 | 22 | 0.17 |
| History of benign breast disease (%) | 60 | 58 | 58 | 58 | 0.85 |
| Estrone (pg/ml) | 27.4 | 27.7 | 27.1 | 24.3 | 0.02 |
| Estradiol (pg/ml) | 7.47 | 7.75 | 6.72 | 6.76 | 0.02 |
| Estrone Sulfate (pg/ml) | 241 | 237 | 232 | 210 | 0.09 |
*
Cigarettes/day were recorded in categories of 1:1–4, 2:5–14, 3:15–24, 4:25–34, 5:35–44, 6:≥45 cigarettes/day.