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Table 1 Characteristics of the cases (n = 4024)

From: Ambient air pollution is associated with pediatric pneumonia: a time-stratified case–crossover study in an urban area

Characteristic Number %
Age (mean ± SD) 5.0 ± 3.6  
Male sex 2144 53.3
Respiratory disease 305 7.6
Asthma 250 6.2
Cerebral palsy 124 3.1
Epilepsy 110 2.7
Warm season 2192 54.5
Warm days (≥26.5 °C) 1762 43.8