Table 1 Study population characteristics
From: Telomere tracking from birth to adulthood and residential traffic exposure
Maternal | n = 117 |
 Maternal age, years | 26.7 ± 4.1 |
 Smoking during pregnancy, n | 13 (11.1) |
 Socioeconomic status: maternal education |  |
  Low | 46 (39.3) |
  Middle | 28 (23.9) |
  High | 43 (36.8) |
Birth | n = 184 |
 Gestational age, weeks | 37.2 ± 2.5 |
 Neonate birth weight, g | 2589 ± 506 |
 Twin birth year | 1976 ± 3.2 |
 Zygosity – Chorionicity |  |
  Dizygotic – Dichorionic | 63 (34.2) |
  Monozygotic – Dichorionic | 55 (29.9) |
  Monozygotic – Monochorionic | 66 (35.9) |
Adulthood | n = 184 |
 Age, years | 22.6 ± 3.1 |
 Sex |  |
  Male | 93 (50.5) |
  Female | 91 (49.5) |
 Body mass index, kg/m2 | 21.5 ± 2.7 |
 Smokers, n | 64 (34.8) |
 Gamma-glutamyl transferase, U/L | 17.8 ± 11.1 |
 Total cortisol (μg/dL) | 97.1 ± 41.4 |
 Complete-pair in final study |  |
  One twin | 50 (42.7) |
  Both twins | 134 (57.3) |
 Moved since birth | 122 (66.3) |