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Cold-related respiratory symptoms in the general population

Authors

  • Terttu Harju,

    Corresponding author
    1. Institute of Clinical Medicine, Department of Internal Medicine, Centre of Excellence in Research, University of Oulu, Oulu, Finland
    2. Department of Internal Medicine, Oulu University Hospital, Oulu, Finland
      Terttu Harju, MD, PhD, Institute of Clinical Medicine, Department of Internal Medicine, Centre of Excellence in Research, P.O. Box 5000, University of Oulu, FI-90014
      Oulu, Finland.
      Tel: +358 8 3153688
      Fax: +358 8 3154139
      email: terttu.harju@oulu.fi
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  • Tiina Mäkinen,

    1. Institute of Health Sciences, University of Oulu, Oulu, Finland
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  • Simo Näyhä,

    1. Institute of Health Sciences, University of Oulu, Oulu, Finland
    2. Finnish Institute of Occupational Health, Oulu, Finland
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  • Tiina Laatikainen,

    1. Department of Health Promotion and Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
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  • Pekka Jousilahti,

    1. Department of Health Promotion and Chronic Disease Prevention, National Institute for Health and Welfare, Helsinki, Finland
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  • Juhani Hassi

    1. Institute of Health Sciences, University of Oulu, Oulu, Finland
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  • Authorship
    The study was conceived by JH, TH, TM and SN. The cold questionnaire was designed by JH, SN and TM jointly with the research team at the Kastelli Research Institute, Oulu. The data analysis was conducted by SN. TL and
    PJ participated in the FINRISK 2002 main
    study and in the designing of the main questionnaire. All authors participated in the writing of the manuscript and the revising of the final version.

  • Ethics
    The study protocol was approved by the Coordinating Ethics Committee of the Helsinki University Hospital.

  • Conflict of interest
    The authors have stated explicitly that there are no conflicts of interest in connection with this article.

Terttu Harju, MD, PhD, Institute of Clinical Medicine, Department of Internal Medicine, Centre of Excellence in Research, P.O. Box 5000, University of Oulu, FI-90014
Oulu, Finland.
Tel: +358 8 3153688
Fax: +358 8 3154139
email: terttu.harju@oulu.fi

Abstract

Introduction:  Cold-related respiratory symptoms are common among northern populations, especially among people suffering from respiratory diseases. However, the prevalence of such symptoms in the general population and the threshold temperatures at which the symptoms start to emerge are poorly known.

Objectives:  The present study determined the prevalence and threshold temperatures of self-reported respiratory symptoms related to cold, separately for healthy people and those with respiratory disease.

Materials and Methods:  Six thousand five hundred ninety-one men and women aged 25 years–74 years from the national FINRISK study were queried about cold-related respiratory symptoms. The results were expressed as age-adjusted prevalence figures and coefficients from multivariate regressions.

Results:  Cold-related respiratory symptoms were more often reported by people with asthma (men 69%/women 78%) and by subjects with chronic bronchitis (65%/76%) than the healthy subjects (18%/21%). A binomial regression showed an increase of symptom prevalence by age and excesses of 4%, 50% and 21% units because of female sex, asthma and chronic bronchitis, respectively. The reported threshold temperature for cold-related symptoms was −14°C for males and −15°C for females, and it showed some increase by age (0°C–5°C), asthma (2°C) and chronic bronchitis (3°C). The threshold temperature for mucus production was exceptional as it decreased by age (2°C–5°C) and asthma (2°C). The effects of smoking and education were marginal.

Conclusion:  Cold-related respiratory symptoms are common in patients with chronic respiratory diseases, but they start to emerge at relatively low temperatures. In a cold climate, the cold-related symptoms may have an impact on the health-related quality of life.

Please cite this paper as: Harju T, Mäkinen T, Näyhä S, Laatikainen T, Jousilahti P and Hassi J. Cold-related respiratory symptoms in the general population. The Clinical Respiratory Journal 2010; 4: 176–185.

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