Abstract
Purpose
A study was conducted to investigate whether prolonged periods of very cold temperatures were associated with an increased risk of hospitalization for asthma.
Methods
Hospitalization admissions with a principal diagnosis of asthma were identified in New York State, USA, for the months November through April from 1991 to 2006. A cold spell was defined as three or more consecutive days where the daily mean of universal apparent temperature (UAT) within a week prior to admission was at the 10th percentile or less. The percentage change in asthma hospitalizations during and after a cold spell was compared to the average daily number of hospitalizations preceding the cold spell using time series analysis.
Results
The average temperature during winter cold spells (December through March) was −15 °C, compared to −6 and −2 °C for cold spells in November and April, respectively. Cold spells during the winter months were associated with a mean decline of 4.9 % in asthma admissions statewide (95 % CI −7.8, −1.9 %). After a cold spell, no statistically significant changes were apparent during the winter months, but asthma hospitalizations increased after cold spells in the transitional months of November (mean = 9.6, 95 % CI 5.5, 13.9 %) and April (mean = 5.0, 95 % CI 1.2, 9.0 %).
Conclusions
The results suggest that during prolonged periods of severe cold asthmatics may adhere to medical guidelines and limit their exposure, thereby preventing exacerbations. They may be less likely to alter their behavior in the more moderate months of November and April.
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Acknowledgments
This work was supported in part by Grant # 5U01EH000396 from the National Center for Environmental Health, Centers for Disease Control and Prevention (CDCP), Atlanta, Georgia, USA. The content is solely the responsibility of the authors and does not necessarily represent the official view of CDCP.
Conflict of interest
The authors declare that they have no actual or potential conflicts of interest.
Ethical Standards
The study was approved for human subjects protection by the Institutional Review Board of the New York State Department of Health, Albany, NY, USA, and adheres to all current laws of the USA.
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Fitzgerald, E.F., Pantea, C. & Lin, S. Cold Spells and the Risk of Hospitalization for Asthma: New York, USA 1991–2006. Lung 192, 947–954 (2014). https://doi.org/10.1007/s00408-014-9645-y
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DOI: https://doi.org/10.1007/s00408-014-9645-y