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Mean RRi 
The Mean RRi value is sent as part of the final results.
The application can receive the Mean RRi result by implementing VitalSignsListener:
Dart
@override
void onFinalResults(VitalSignsResults results) {
    VitalSign? vitalSign = results.getResult(VitalSignTypes.meanRri);
    if (vitalSign != null && vitalSign is VitalSignMeanRri) {
        VitalSignMeanRri meanRri = vitalSign;
        print("Mean Rri: ${meanRri.value}");
        print("Confidence Level: ${meanRri.confidence?.level.toString() ?? "N/A"}");
    }
}For general information about vital signs see the Vital Signs and Health Indicators Information Page.
For a list of supported vital signs per platform and measurement mode (face/finger) see the Supported Vital Signs Page.