Evidence map›Paper›PMID 27421832›Full record

ArticleEuropean clinical respiratory journal2016

Chronic bronchitis in West Sweden - a matter of smoking and social class.

Malin Axelsson, Linda Ekerljung, Jonas Eriksson, Stig Hagstad, Eva Rönmark, Jan Lötvall, Bo Lundbäck

Open access · goldAbstract read
In one paragraph

Article in European clinical respiratory journal, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 12 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
12citing papers in PubMed, 1 pooled it
2.6field-weighted citation impact, top 10% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

12 citing papers in PubMed, 1 synthesis or guideline pooled it, 18 citations in OpenAlex.

  1. Pooled it
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  4. Review
  5. Chronic productive cough and inhalant occupational exposure-a study of the general population.International archives of occupational and environmental health · 2021
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

7 authors at 3 institutions in 1 country.

Malin AxelssonDepartment of Care Science, Faculty of Health and Society, Malmö University, Malmö, Sweden.
Linda EkerljungDepartment of Internal Medicine and Clinical Nutrition, Krefting Research Centre and Environmental and Occupational Medicine, University of Gothenburg, Gothenburg, Sweden.
Jonas ErikssonDepartment of Internal Medicine and Clinical Nutrition, Krefting Research Centre and Environmental and Occupational Medicine, University of Gothenburg, Gothenburg, Sweden.
Stig HagstadDepartment of Internal Medicine and Clinical Nutrition, Krefting Research Centre and Environmental and Occupational Medicine, University of Gothenburg, Gothenburg, Sweden.
Eva RönmarkResearch and Development, Obstructive Lung Disease In Northern Sweden (OLIN) Studies, Norrbotten County Council, Luleå, Sweden.
Jan LötvallDepartment of Internal Medicine and Clinical Nutrition, Krefting Research Centre and Environmental and Occupational Medicine, University of Gothenburg, Gothenburg, Sweden.
Bo LundbäckDepartment of Internal Medicine and Clinical Nutrition, Krefting Research Centre and Environmental and Occupational Medicine, University of Gothenburg, Gothenburg, Sweden.
University of Gothenburg · SEUmeå University · SEVästerbotten County · SE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundAlthough chronic bronchitis is associated with impaired quality of life, hospitalisations and increased mortality, it has been less in focus after the introduction of the term chronic obstructive pulmonary disease (COPD). There are no recent published data on the prevalence of chronic bronchitis from the Scandinavian countries.

aimThe main aim of the present study was to estimate the prevalence of chronic bronchitis in West Sweden by using data from a large-scale epidemiological study of the general population. A further aim was to identify current risk factors for chronic bronchitis in a population with a major decrease in the proportion of smokers.

methodsFrom the 18,087 questionnaire responders out of 30,000 invited to participate at the West Sweden Asthma Study, 2,000 subjects were randomly selected and invited to detailed clinical examinations performed during 2009-2013. A total of 1,172 subjects aged 17-79 participated in the examinations which included, among others, spirometry and structured interviews. Chronic bronchitis was defined according to reported symptoms.

resultsThe overall prevalence of chronic bronchitis was 7.2% (men 7.6%; women 6.8% ns), and it was 8.7% in subjects older than age 60. Chronic bronchitis was strongly associated with smoking, defined both as current smoking status and pack-years. Other risk factors were increasing age, low socio-economic class and urban living. Of those with chronic bronchitis, 22% fulfilled the GOLD criteria of COPD.

conclusionThe prevalence of chronic bronchitis was somewhat lower than found by studies in Sweden in the 1980s and the prevalence was now similar in men and women. Although smoking was still the dominating risk factor for chronic bronchitis, the relative importance of smoking had decreased parallel with a decreasing smoking prevalence, while the relative importance of other factors than smoking had increased compared to previous studies.

Indexed as

chronic bronchitisepidemiologypopulation studyrespiratory tract diseaserisk factors

Identifiers

PMID27421832
PMCPMC4947195
OpenAlexW2463371545

What OpenQuestion holds

Textmetadata
LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.