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Table 2 Basic characteristics of the study population

From: Traffic-related air pollution and respiratory symptoms among asthmatic children, resident in Mexico City: the EVA cohort study

Characteristics Asthmatics
(n = 147)
Nonasthmatics
(n = 50)
p value
Sex (% male) 60.5 43.4 0.031
Age [years(mean ± SD)] 9.6 ± 2.1 9.3 ± 2.2 0.975
Weight (kg)§ 38.0 (28.0, 48.0) 32.3 (26.0, 44.6) 0.064
Height (cm)§ 139.7 (125.0, 148.0) 132.5 (126.8, 146.2) 0.343
Maternal schooling [years(mean ± SD)] 9.7 ± 3.0 9.3 ± 3.1 0.436
Paternal smoking at home (%) 53.9 47.5 0.539
Maternal smoking at home (%) 41.2 26.2 0.135
Pets at home (%) 55.8 71.7 0.043
Carpet at home (%) 15.6 34.0 0.005
Humidity at home (%) 42.2 39.2 0.711
Prick test positivity (%) 89.2 79.1 0.089
Moderate persistent asthma (%) 19.1   
Mild persistent asthma (%) 23.8   
Mild intermittent asthma (%) 56.5   
Symptoms within the past 12 months (%)    
   Dry coughing 66.7 24.5 0.000
   Wheezing at least one time ‡ 57.8 8.3 0.001
   Rhinitis ever 38.2 7.7 0.000
  1. Q, quartile.
  2. §Mann-Whitney Test [median (Q25, Q75)]
  3. Fisher Exact Test