Fig. 3From: Fine particulate matter constituents associated with emergency room visits for pediatric asthma: a time-stratified case–crossover study in an urban areaOdds ratios (ORs) for pediatric asthma ED visits according to IQR increments. a nitrate and b organic carbon on lag 3 after adjustment for temperature and humidity. *p < 0.05. Int p, interaction p-valueBack to article page