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Wellness Index 
The Wellness Index value is sent as part of the final results.
The application can receive the Wellness Index result by implementing VitalSignsListener:
Kotlin
override fun onFinalResults(results: VitalSignsResults) {
    runOnUiThread {
        (results.getResult(VitalSignTypes.WELLNESS_INDEX) as? VitalSignWellnessIndex)?.let { wellnessIndex ->
            Log.i("VITAL SIGN", "Wellness Index: ${wellnessIndex.value}")
        }
    }
}Java
@Override
public void onFinalResults(final VitalSignsResults results) {
    runOnUiThread(() -> {
        VitalSignWellnessIndex wellnessIndex = (VitalSignWellnessIndex) results.getResult(VitalSignTypes.WELLNESS_INDEX);
        if (wellnessIndex != null) {
            Log.i("VITAL SIGN", "Wellness Index: " + wellnessIndex.getValue());
        }
    });
}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.
Important
Note that vital signs are sent on a background thread. The application must switch to the UI thread in order to perform UI updates.