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Table 1 Characteristics of the study population (n = 80)

From: Recent exposure to ultrafine particles in school children alters miR-222 expression in the extracellular fraction of saliva

Variable  
Boys 37 (46.3 %)
Age, years 10.44 ± 0.97
BMI, kg/m2 17.01 ± 2.42
TV watching, hours/week 9.32 ± 5.46
Exposure to tobacco smoke 9 (11.2 %)
Maternal education  
  Low 26 (32.5 %)
  High 54 (67.5 %)
  1. High maternal education was defined as college or university
  2. Mean ± SD; frequency (%)
  3. SD standard deviation, BMI body mass index