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Receiver Operating Characteristic Plot

Receiver Operating Characteristic Plot

A ROC (Receiver Operating Characteristic) plot is a graphical tool used to assess the performance of a binary classification model by illustrating the trade-off between sensitivity (true positive rate) and specificity (false positive rate). By plotting sensitivity against 1 - specificity across various threshold settings, the ROC curve shows how well the model distinguishes between classes, with a curve closer to the top-left corner indicating a more accurate model. The area under the ROC curve...

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¹From the Department of Sport, Recreation and Exercise Science, Faculty of Community and Health Sciences, University of the Western Cape, Cape Town, South Africa.

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|December 29, 2025

Summary

Cardiovascular health and physical fitness measures accurately predict physical ability test performance in firefighters. These findings suggest that assessing these health indicators can help identify firefighters likely to pass or fail essential job performance tests.

Keywords:

cardiovascular health diagnostic accuracy firefighters musculoskeletal health occupational performance physical fitness

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Area of Science:

Occupational health and safety
Firefighter performance assessment
Cardiovascular health and fitness

Background:

Firefighters require high physical capacity for job performance.
Physical ability tests (PATs) are crucial for assessing firefighter readiness.
The diagnostic accuracy of using cardiovascular health (CVH) and physical fitness for PAT performance needs further investigation.

Purpose of the Study:

To determine the diagnostic accuracy of CVH and physical fitness indicators for predicting PAT performance in firefighters.
To establish reliable metrics for assessing firefighter physical capability.

Main Methods:

A cross-sectional study involving 282 firefighters.
Data collection included sociodemographic, CVH, physical fitness, and PAT data via questionnaires and physical measures.
Receiver-operating characteristic (ROC) curve analysis was employed to assess diagnostic accuracy.

Main Results:

A body fat percentage cut-off of 22.1% showed 75% specificity for failing the PAT.
Cardiorespiratory fitness (aV̇O2max of 3.2 L·min), grip strength (>73.2 kg), and leg strength (>96.3 kg) demonstrated high sensitivity (84-92%) for passing the PAT.
Muscular endurance (push-ups and sit-ups >25 repetitions) showed 74-75% sensitivity for passing the PAT.

Conclusions:

Cardiovascular health and physical fitness measures serve as effective indicators of physical ability test performance in firefighters.
These findings support the use of CVH and fitness assessments for predicting firefighter PAT outcomes.