Research prototype—not for clinical diagnosis or treatment. BRPI has not yet been trained or validated in patient cohorts. The displayed probabilities and thresholds are illustrative. This application must not delay urgent assessment, endoscopy, reflux monitoring, cardiac evaluation, or other clinically indicated care.

Bivariate Reflux Probability Instrument

Retain frequency and intensity as separate dimensions

This research demonstrator shows how GERD-related symptom frequency and intensity can be kept as distinct inputs rather than collapsed into additive questionnaire points. Probabilities and zones are illustrative only.

Frequency

How many days (or nights) a symptom occurred in the past seven days.

Intensity

How severe the symptom felt on a 0–10 scale with plain-language anchors.

Choose an entry mode

Illustrative reference case

Load the fictional manuscript case with pre-filled parameters to instantly reproduce the published demonstration calculation.

Interactive exploration

Open a blank session to enter your own fictional or demonstration responses. No personally identifying information is required.