Evidence map›Paper›PMID 28506327›Full record

ArticleInfection control and hospital epidemiology2017

The Seasonal Variability in Surgical Site Infections and the Association With Warmer Weather: A Population-Based Investigation.

Chris A Anthony, Ryan A Peterson, Linnea A Polgreen, Daniel K Sewell, Philip M Polgreen

Abstract read
In one paragraph

Article in Infection control and hospital epidemiology, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 47 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
47citing papers in PubMed, 1 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

47 citing papers in PubMed, 1 synthesis or guideline pooled it.

  1. Association between extreme weather events and postoperative adverse outcomes: a systematic review.Canadian journal of anaesthesia = Journal canadien d'anesthesie · 2025
    Pooled it
  2. Trial
  3. Article
  4. Climate change and antimicrobial resistance.Nature reviews. Microbiology · 2026
    Review
  5. Seasonal trends in surgical site infections after hernia repair.Hernia : the journal of hernias and abdominal wall surgery · 2026
    Article
  6. Climatic and clinical risk factors for surgical site infection following spine fusion surgery: a large-scale big data analysis.European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society · 2026
    Article
  7. Article
  8. Review
  9. Article
  10. Article
  11. Observational
  12. Variation in facility-level likelihood of drug-resistantAntimicrobial stewardship & healthcare epidemiology : ASHE · 2025
    Article
  13. Article
  14. Article
  15. Article
  16. Article
  17. Article
  18. Review
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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

5 authors.

Chris A Anthony1Department of Orthopaedic Surgery and Rehabilitation,University of Iowa Hospitals and Clinics,Iowa City,Iowa.
Ryan A Peterson2Department of Biostatistics,University of Iowa,Iowa City,Iowa.
Linnea A Polgreen3Department of Pharmacy Practice and Science,University of Iowa,Iowa City,Iowa.
Daniel K Sewell2Department of Biostatistics,University of Iowa,Iowa City,Iowa.
Philip M Polgreen4Departments of Internal Medicine and Epidemiology,University of Iowa Hospitals and Clinics,Iowa City,Iowa.

Funding

Observational data and treatment effectiveness: which methods work best?K25HL122305 · NHLBI · UNIVERSITY OF IOWA · PI POLGREEN, LINNEA ANN · 2015 to 2018
$588k
NHLBI NIH HHS K25 HL122305
6 · The paper itself

Abstract

OBJECTIVE To determine whether the seasonality of surgical site infections (SSIs) can be explained by changes in temperature. DESIGN Retrospective cohort analysis. SETTING The National Inpatient Sample database. PATIENTS All hospital discharges with a primary diagnosis of SSI from 1998 to 2011 were considered cases. Discharges with a primary or secondary diagnoses of specific surgeries commonly associated with SSIs from the previous and current month served as our "at risk" cohort. METHODS We modeled the national monthly count of SSI cases both nationally and stratified by region, sex, age, and type of institution. We used data from the National Climatic Data Center to estimate the monthly average temperatures for all hospital locations. We modeled the odds of having a primary diagnosis of SSI as a function of demographics, payer, location, patient severity, admission month, year, and the average temperature in the month of admission. RESULTS SSI incidence is highly seasonal, with the highest SSI incidence in August and the lowest in January. During the study period, there were 26.5% more cases in August than in January (95% CI, 23.3-29.7). Controlling for demographic and hospital-level characteristics, the odds of a primary SSI admission increased by roughly 2.1% per 2.8°C (5°F) increase in the average monthly temperature. Specifically, the highest temperature group, >32.2°C (>90°F), was associated with an increase in the odds of an SSI admission of 28.9% (95% CI, 20.2-38.3) compared to temperatures <4.4°C (<40°F). CONCLUSIONS At population level, SSI risk is highly seasonal and is associated with warmer weather. Infect Control Hosp Epidemiol 2017;38:809-816.

Indexed as

SeasonsTemperatureAdolescentAdultAgedAged, 80 and overFemaleHumansMaleMiddle AgedModels, TheoreticalRetrospective StudiesSurgical Wound InfectionUnited StatesYoung Adult

Identifiers

PMID28506327
PMCPMC5832937

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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.