Body Roundness Index and Mortality in ICU Patients (BRI-ICU)

June 5, 2026 updated by: Ozkul Yilmaz Colak, Ondokuz Mayıs University

Body Roundness Index as a Predictor of Mortality in Adult Intensive Care Unit Patients: A Prospective Multicenter Cohort Study (BRI-ICU)

This study investigates whether Body Roundness Index (BRI), an anthropometric measure derived from waist circumference and height, can predict mortality in adult intensive care unit (ICU) patients. BRI captures central adiposity and body fat distribution more accurately than Body Mass Index (BMI). In this prospective multicenter cohort study, BRI will be measured at ICU admission and its association with ICU mortality, 28-day mortality, hospital mortality, mechanical ventilation duration, ICU length of stay, and acute kidney injury will be evaluated. The predictive performance of BRI will also be compared with BMI.

Study Overview

Status

Not yet recruiting

Conditions

Detailed Description

Body Roundness Index (BRI) is calculated using waist circumference and height, and reflects central adiposity more precisely than BMI. Despite growing evidence supporting BRI as a cardiovascular and metabolic risk predictor in general populations, its prognostic value in critically ill patients remains unexplored.

In this prospective multicenter cohort study, adult patients admitted to participating ICUs will be enrolled. Waist circumference will be measured using a standardized protocol (supine position, iliac crest landmark, end-expiration, inelastic tape, 0.1 cm precision) within 24 hours of ICU admission. BRI will be calculated using the formula: 364.2 - 365.5 × √(1 - ((WC/2π)² / (0.5×height)²)).

The primary outcome is ICU mortality. Secondary outcomes include 28-day mortality, hospital mortality, mechanical ventilation duration, ICU length of stay, and new acute kidney injury (KDIGO stage ≥2). The shape of the BRI-mortality relationship will be assessed using restricted cubic splines. BRI and BMI will be compared head-to-head for discriminative performance. Subgroup analyses will include sepsis patients to evaluate whether BRI resolves the obesity paradox observed with BMI.

Study Type

Observational

Enrollment (Estimated)

550

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Locations

  • Turkey (Türkiye)
    • Atakum
      • Samsun, Atakum, Turkey (Türkiye), 55002
        • Ondokuz Mayis University, School of Medicine
        • Contact:

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Sampling Method

Non-Probability Sample

Study Population

Adult patients admitted to the intensive care units of participating tertiary care centers in Turkey. Enrollment will be conducted prospectively across multiple centers following ethics committee approval at each site.

Description

Inclusion Criteria:

  • Age ≥18 years
  • ICU admission with expected stay ≥24 hours
  • Waist circumference and height measurable within 24 hours of admission

Exclusion Criteria:

  • Age <18 years
  • ICU stay <24 hours
  • Missing or unmeasurable anthropometric data (e.g., severe edema, abdominal wound, morbid obesity precluding measurement)
  • Pregnancy
  • Readmission (only first ICU admission included)

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Cohorts and Interventions

Group / Cohort
Adult ICU Patients
Adult patients (≥18 years) admitted to the intensive care unit with an expected stay of ≥24 hours. Waist circumference and height are measured within 24 hours of admission to calculate Body Roundness Index (BRI) and BMI. Patients are followed for ICU mortality, 28-day mortality, hospital mortality, mechanical ventilation duration, ICU length of stay, and acute kidney injury (KDIGO stage ≥2). No intervention is applied; this is a prospective observational cohort.

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
ICU Mortality
Time Frame: From ICU admission to ICU discharge or death, up to 28 days.
Death occurring during ICU stay, assessed from admission to ICU discharge or death, whichever comes first.
From ICU admission to ICU discharge or death, up to 28 days.

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
28-Day Mortality
Time Frame: 28 days from ICU admission.
All-cause mortality within 28 days of ICU admission.
28 days from ICU admission.
Hospital Mortality
Time Frame: From ICU admission to hospital discharge or death, up to 90 days.
Death occurring during hospital stay
From ICU admission to hospital discharge or death, up to 90 days.
Mechanical Ventilation Duration
Time Frame: From ICU admission to ICU discharge, up to 28 days.
Total days of invasive mechanical ventilation during ICU stay.
From ICU admission to ICU discharge, up to 28 days.
ICU Length of Stay
Time Frame: From ICU admission to ICU discharge, up to 28 days.
Total number of days spent in the ICU
From ICU admission to ICU discharge, up to 28 days.
Number of Participants with New Acute Kidney Injury (KDIGO Stage ≥2)
Time Frame: From ICU admission to ICU discharge, up to 28 days.
New AKI development defined as KDIGO stage ≥2 during ICU stay.
From ICU admission to ICU discharge, up to 28 days.

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Ondokuz Mayıs University

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

August 1, 2026

Primary Completion (Estimated)

August 1, 2027

Study Completion (Estimated)

December 1, 2027

Study Registration Dates

First Submitted

June 1, 2026

First Submitted That Met QC Criteria

June 5, 2026

First Posted (Actual)

June 8, 2026

Study Record Updates

Last Update Posted (Actual)

June 8, 2026

Last Update Submitted That Met QC Criteria

June 5, 2026

Last Verified

June 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • ICU-BRI-001

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

YES

IPD Plan Description

De-identified individual participant data underlying published results will be made available upon reasonable request.

IPD Sharing Time Frame

Beginning 6 months after primary results publication, available for 2 years.

IPD Sharing Access Criteria

Researchers who provide a methodologically sound proposal. Requests should be directed to the corresponding author. Data will be shared after signing a data access agreement.

IPD Sharing Supporting Information Type

  • STUDY_PROTOCOL
  • SAP
  • ICF

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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