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Table 1 Study population characteristics

From: Blood pressure in young adulthood and residential greenness in the early-life environment of twins

Characteristic
Maternal (n = 146) Adulthood (n = 278)
Maternal age, years 27.4 ± 4.5 Age, years 20.9 ± 1.9
Socioeconomic status: maternal education Body mass index, kg/m2 21.1 ± 2.8
 Low 59 (40.4) Smokers, n 87 (31.3)
 Middle 32 (21.9) Physical activity score 4.73 ± 2.2
 High 55 (37.7) Potassium excretion, mmol/day 63.2 ± 28.4
Neighborhood income, euro 19,447 ± 4202 Sodium excretion, mmol/day 128.1 ± 59.4
Smoking during pregnancy 21 (14.4) Gamma-Glutamyl Transferase, U/L 16.6 ± 8.54
   Zygosity - Chorionicity  
Birth (n = 278)  Dizygotic-Dichorial 108 (38.8)
Gestational age, weeks 37.0 ± 2.4  Monozygotic-Dichorial 83 (29.9)
Neonate birth weight, g 2524 ± 497  Monozygotic-Monochorial 87 (31.3)
Sex   Complete-pair in final study  
 Male 149 (53.6)  One twin 14 (5.0)
 Female 129 (46.4)  Both twins 264 (95.0)
Twin birth year 1978 ± 2.0 Moved since birth 181 (65.1)
  1. Data presented are means ± standard deviation or number (percentage)