Seasons can influence the results of the methacholine challenge test
Annals of Thoracic Medicine, 04/02/2012Sposato B et al.
There was a higher probability of finding bronchial hyper–responsiveness (BHR) in outpatients with suspected asthma in autumn and spring compared with summer. Spring is the season where BHR may be more severe. Females and overweight/obese subjects were those mainly involved in this seasonal variability of BHR.
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