Evidence map›Paper›PMID 26056439›Full record

ArticleInternational journal of chronic obstructive pulmonary disease2015

Seasonality, ambient temperatures and hospitalizations for acute exacerbation of COPD: a population-based study in a metropolitan area.

Pere Almagro, Carme Hernandez, Pable Martinez-Cambor, Ricard Tresserras, Joan Escarrabill

Open access · goldAbstract read
In one paragraph

Article in International journal of chronic obstructive pulmonary disease, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.

0numbers the graph read from it
0cells of the map it votes in
21citing papers in PubMed
6.9field-weighted citation impact, top 3% 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

21 citing papers in PubMed, 61 citations in OpenAlex.

  1. Seasonal variations in exacerbations and deaths in patients with COPD during the TIOSPIRInternational journal of chronic obstructive pulmonary disease · 2018
    Trial
  2. Biomarkers Predictive of Exacerbations in the SPIROMICS and COPDGene Cohorts.American journal of respiratory and critical care medicine · 2017
    Trial
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  16. Seasonal variability in clinical care of COPD outpatients: results from the Andalusian COPD audit.International journal of chronic obstructive pulmonary disease · 2017
    Article
  17. Article
  18. Observational
  19. Article
  20. Increased vulnerability of COPD patient groups to urban climate in view of global warming.International journal of chronic obstructive pulmonary disease
    Article
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

5 authors at 2 institutions in 2 countries.

Pere AlmagroAcute Geriatric Care Unit, Internal Medicine, University Hospital Mútua de Terrasa, University of Barcelona, Barcelona, Spain.
Carme HernandezRespiratory Disease Management Plan, Department of Health of the Autonomous Government of Catalonia, Observatory of Respiratory Therapy, Spain ; Integrated Care Unit, Medical and Nursing Management, Hospital Clínic Barcelona, Barcelona, Spain ; Chronic Diseases Care Program, Hospital Clinic, Hospital Clínic & REDISSEC (Health Services Research on Chronic Patients Network), Barcelona, Spain.
Pable Martinez-CamborOficina de Investigación Biosanitaria de Oviedo, Asturias, Spain ; Universidad Autonoma de Chile, Santiago, Chile.
Ricard TresserrasRespiratory Disease Management Plan, Department of Health of the Autonomous Government of Catalonia, Observatory of Respiratory Therapy, Spain ; Health Department, Hospital Clinic, Hospital Clínic & REDISSEC (Health Services Research on Chronic Patients Network), Barcelona, Spain.
Joan EscarrabillRespiratory Disease Management Plan, Department of Health of the Autonomous Government of Catalonia, Observatory of Respiratory Therapy, Spain ; Chronic Diseases Care Program, Hospital Clinic, Hospital Clínic & REDISSEC (Health Services Research on Chronic Patients Network), Barcelona, Spain.
National Observatory · BRGovernment of Catalonia · ES

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundExcluding the tropics, exacerbations of chronic obstructive pulmonary disease (COPD) are more frequent in winter. However, studies that directly relate hospitalizations for exacerbation of COPD to ambient temperature are lacking. The aim of this study was to assess the influence of temperature on the number of hospitalizations for COPD.

methodsThis was a population-based study in a metropolitan area. All hospital discharges for acute exacerbation of COPD during 2009 in Barcelona and its metropolitan area were analyzed. The relationship between the number of hospitalizations for COPD and the mean, minimum, and maximum temperatures alongside comorbidity, humidity, influenza rate, and environmental pollution were studied.

resultsA total of 9,804 hospitalization discharges coded with COPD exacerbation as a primary diagnosis were included; 75.4% of cases were male with a mean age of 74.9±10.5 years and an average length of stay of 6.5±6.1 days. The highest number of admissions (3,644 [37.2%]) occurred during winter, followed by autumn with 2,367 (24.1%), spring with 2,347 (23.9%), and summer with 1,446 (14.7%; P<0.001). The maximum, minimum, and mean temperatures were associated similarly with the number of hospitalizations. On average, we found that for each degree Celsius decrease in mean weekly temperature, hospital admissions increased by 5.04% (r(2)=0.591; P<0.001). After adjustment for humidity, comorbidity, air pollution, and influenza-like illness, only mean temperatures retained statistical significance, with a mean increase of 4.7% in weekly admissions for each degree Celsius of temperature (r(2)=0.599, P<0.001).

conclusionMean temperatures are closely and independently related to the number of hospitalizations for COPD.

Indexed as

Patient AdmissionSeasonsTemperatureUrban HealthAgedAged, 80 and overAir PollutionComorbidityDatabases, FactualDisease ProgressionFemaleHumansHumidityInfluenza, HumanMaleMiddle Agedchronic obstructive pulmonary diseasehospitalizationhumiditypollutionseasonality

Identifiers

PMID26056439
PMCPMC4431472
OpenAlexW1876103324

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC
Read underepoch 390

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.