Table 1.
Mean and Standard Deviation Values for Characteristics of Key Variables by Quartile of Relative Telomere Length, Nurses’ Health Study, 1989–1990
| Variable | Quartile of Telomere Length |
P for Trenda | |||
|---|---|---|---|---|---|
| 1 (n = 1,164) | 2 (n = 1,153) | 3 (n = 1,135) | 4 (n = 1,152) | ||
| Age, years | 59.8 (6.4) | 59.3 (6.3) | 59.1 (6.6) | 58.4 (6.8) | <0.0001 |
| Smoking, pack-years | 13.1 (19.2) | 12.3 (17.8) | 12.7 (19.6) | 11.6 (17.7) | 0.27 |
| Body mass indexb | 25.8 (5.0) | 25.7 (4.9) | 25.4 (4.7) | 25.4 (4.5) | 0.03 |
| Physical activity level, MET/week | 16.9 (26.9) | 16.9 (25.5) | 16.1 (19.2) | 16.2 (17.7) | 0.47 |
| Total calcium intake, mg/day | 1132.7 (571.9) | 1115.1 (557.0) | 1154.3 (576.2) | 1143.5 (559.5) | 0.28 |
| Total folate intake, μg/day | 472.5 (243.3) | 467.1 (230.8) | 478.6 (241.3) | 482.3 (246.8) | 0.23 |
| Total retinol intake, IU/day | 4143.6 (4122.4) | 4171.6 (4429.6) | 4229.7 (4306.9) | 4190.8 (4278.1) | 0.62 |
Abbreviation: MET/week, metabolic equivalents per week.
a Age-adjusted linear regression P value for other variables.
b Weight (kg)/height (m)2.