Evidence map›Paper›PMID 29161655›Full record

ArticleEnvironmental research2018

The association between ambient temperature and mortality in South Africa: A time-series analysis.

Noah Scovronick, Francesco Sera, Fiorella Acquaotta, Diego Garzena, Simona Fratianni, Caradee Y Wright, Antonio Gasparrini

Abstract read
In one paragraph

Article in Environmental research, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 63 papers, 10 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
63citing papers in PubMed, 10 pooled it
–field-weighted citation impact
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

63 citing papers in PubMed, 10 syntheses or guidelines pooled it.

  1. Building the model: a review of input structures in extreme temperature-health.Environmental health : a global access science source · 2026
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  7. The Effect of High and Low Ambient Temperature on Infant Health: A Systematic Review.International journal of environmental research and public health · 2022
    Pooled it
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  9. Association between moderately cold temperature and mortality in China.Environmental science and pollution research international · 2020
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  17. Impacts of Ambient Temperatures on Pediatric Anemia in Sub-Saharan Africa: A Regional Ecological Study.International journal of environmental research and public health · 2025
    Article
  18. Narrative Review on Infants' Thermoregulatory Response to Heat.International journal of environmental research and public health · 2025
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  20. Article

3 more citing papers are in PubMed but not listed here.

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.

Noah ScovronickWoodrow Wilson School, Princeton University, Princeton, NJ 08544, USA. Electronic address: Noah.Scovronick@princeton.edu.
Francesco SeraDepartment of Social and Environmental Health Research, London School of Hygiene and Tropical Medicine, London WC1H 9SH, UK.
Fiorella AcquaottaDepartment of Earth Sciences, University of Turin, Turin 10124, Italy.
Diego GarzenaDepartment of Earth Sciences, University of Turin, Turin 10124, Italy.
Simona FratianniDepartment of Earth Sciences, University of Turin, Turin 10124, Italy.
Caradee Y WrightEnvironment and Health Research Unit, South African Medical Research Council and Department of Geography, Geoinformatics and Meteorology, University of Pretoria, Pretoria 0001, South Africa.
Antonio GasparriniDepartment of Social and Environmental Health Research, London School of Hygiene and Tropical Medicine, London WC1H 9SH, UK.

Funding

Medical Research Council MR/M022625/1
6 · The paper itself

Abstract

backgroundThere is an extensive literature describing temperature-mortality associations in developed regions, but research from developing countries, and Africa in particular, is limited.

methodsWe conducted a time-series analysis using daily temperature data and a national dataset of all 8.8 million recorded deaths in South Africa between 1997 and 2013. Mortality and temperature data were linked at the district municipality level and relationships were estimated with a distributed lag non-linear model with 21 days of lag, and pooled in a multivariate meta-analysis.

resultsWe found an association between daily maximum temperature and mortality. The relative risk for all-age all-cause mortality on very cold and hot days (1st and 99th percentile of the temperature distribution) was 1.14 (1.10,1.17) and 1.06 (1.03,1.09), respectively, when compared to the minimum mortality temperature. This "U" shaped relationship was evident for every age and cause group investigated, except among 25-44 year olds. The strongest associations were in the youngest (< 5) and oldest (> 64) age groups and for cardiorespiratory causes. Heat effects occurred immediately after exposure but diminished quickly whereas cold effects were delayed but persistent. Overall, 3.4% of deaths (~ 290,000) in South Africa were attributable to non-optimum temperatures over the study period. We also present results for the 52 district municipalities individually.

conclusionsAn assessment of the largest-ever dataset for analyzing temperature-mortality associations in (South) Africa indicates mortality burdens associated with cold and heat, and identifies the young and elderly as particularly vulnerable.

Indexed as

Cold TemperatureHot TemperatureMortalityAdolescentAdultAgedChildChild, PreschoolCitiesHumansInfantMiddle AgedSouth AfricaTemperatureYoung AdultCardiovascularClimateMortalityRespiratorySouth AfricaTemperatureWeather

Identifiers

PMID29161655
PMCPMC5773242

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LicenceCC BY
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Registered trials

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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.