A recent study published in the medical journal, The Clinical Respiratory Journal , determined the prevalence and threshold temperature of respiratory symptoms particularly in those with respiratory diseases.
The study itself included a total of 6591 participants of each gender who ranged in age from 25 to 74 years of age.
Here's what the study authors found:
- Asthma - patients with asthma were more likely to report cold-related respiratory symptoms
- Chronic bronchitis - as above.
- Temperature - the threshold temperature was -15C for males and -14C for females.
- Effects of smoking and education were marginal
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- Harju T, Mäkinen T, Näyhä S, Laatikainen T, Jousilahti P, Hassi J. Cold-related respiratory symptoms in the general population. Clin Respir J. 2010 Jul;4(3):176-85.