# Precision Audiometry and Ecological Validity: Exploring the Link Between Patient-Reported Outcome Measures and Speech Testing in CI Users

## TL;DR

This study examines how patient-reported outcomes relate to speech comprehension tests in cochlear implant users, finding that fluctuating background noise improves ecological validity but reduces test accuracy.

## Contribution

The study introduces a novel comparison between stationary and fluctuating background noise in speech tests for cochlear implant users, linking subjective outcomes with audiometric precision.

## Key findings

- Word scores in quiet correlated significantly with subjective hearing ability (Spearman’s R = 0.57).
- Subjective comprehension scores correlated more strongly with fluctuating background noise than stationary noise.
- Test–retest accuracy decreased when transitioning from stationary to fluctuating background noise.

## Abstract

Background/Objectives: Audiometric methods for hearing-impaired patients are constantly evolving as new therapeutic interventions and improved clinical standards are established. This study aimed to explore the relationship between patient-reported outcome measures in cochlear implant users and scores from audiometric test procedures in quiet and noise. Methods: In a prospective study, 20 postlingually deafened CI users were included. Speech comprehension was measured in quiet (by Freiburg words) and in noise (by the Oldenburg sentence test), while stationary speech-simulating or temporally fluctuating noise was applied and the noise sources were varied. Subjective feedback from the patients was obtained using the HISQUI19 questionnaire. Results: Word scores in quiet showed a significant positive correlation with the user’s subjective assessment of hearing ability using the questionnaire (Spearman’s R = 0.57). A greater correlation of the subjective evaluation of comprehension against fluctuating background noise as compared with stationary background noise was evident. On the other hand, the test–retest accuracy was reduced by a substantial factor in the transition from stationary to fluctuating background noise. Conclusions: By introducing temporal fluctuations in the background noise, the ecological validity can be improved, but at the cost of a parallel decrease in the accuracy of the test procedure. Especially in the context of studies, this knowledge may help to improve the choice of the specific test method used in evaluating the relationship between ecological validity and precision audiometry.