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Table 1 Baseline characteristics of children according to school, Salamanca, 2004 - 2005

From: Impact of air pollution on pulmonary function and respiratory symptoms in children. Longitudinal repeated-measures study

  School 1 n = 239 School 2 n = 225 p
Gender (female/male) 118/121 117/108 0.60
Age (years) 9.0 ± 1.6 9.2 ± 1.5 0.11
Weight (k) 34.8 ± 11.4 36.4 ± 11.6 0.13
Height (cm) 134.0 ± 10.8 135.5 ± 10.6 0.08
BMI 19.1 ± 3.7 19.1 ± 3.6 0.75
Previous diseases and symptoms n (%)    
Bronchitis 29 (12.1) 24 (10.6) 0.74
Pneumonia 17 (7.1) 9 (4.0) 0.14
Cough 219 (91.6) 207 (86.6) 0.16
Acute asthma 3 (1.2) 0 (0.0) 0.34
Acute respiratory tract infections 221 (92.4) 178 (79.1) 0.001
Hospitalization for asthma 2 (0.8) 0 (0.0) 0.60
Hospitalization for acute respiratory tract infections 13 (5.4) 5 (2.0) 0.07
FEV1 (%p)* 102.5 ± 21.1 101.5 ± 14.4 0.55
FVC (%p)* 109.3 ± 23.7 109.2 ± 18.0 0.95
FEV1/FVC (c) 92.6 ± 9.8 91.6 ± 10.0 0.24
PEFR (%p) 106.5 ± 26.7 107.1 ± 24.3 0.81
  1. * Expressed spirometric values such as percentage of the predicted value according to reference values for Mexican children