Evidence map›Paper›PMID 34964557›Full record

ArticlePediatric pulmonology2022

Development and technical validation of a smartphone-based pediatric cough detection algorithm.

Matthijs D Kruizinga, Ahnjili Zhuparris, Eva Dessing, Fas J Krol, Arwen J Sprij, Robert-Jan Doll, Frederik E Stuurman, Vasileios Exadaktylos, Gertjan J A Driessen, Adam F Cohen

Open access · hybridAbstract read
In one paragraph

Article in Pediatric pulmonology, 2022. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 13 papers, 2 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
13citing papers in PubMed, 2 pooled it
2.3field-weighted citation impact, top 10% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

13 citing papers in PubMed, 2 syntheses or guidelines pooled it, 22 citations in OpenAlex.

  1. Cough biomarkers for diagnosis and monitoring of respiratory disease: a systematic review.European respiratory review : an official journal of the European Respiratory Society · 2026
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

10 authors at 4 institutions in 1 country.

Matthijs D KruizingaCentre for Human Drug Research, Leiden, The Netherlands.ORCID 0000-0002-2054-2187
Ahnjili ZhuparrisCentre for Human Drug Research, Leiden, The Netherlands.
Eva DessingCentre for Human Drug Research, Leiden, The Netherlands.
Fas J KrolCentre for Human Drug Research, Leiden, The Netherlands.
Arwen J SprijJuliana Children's Hospital, HAGA Teaching Hospital, The Hague, The Netherlands.
Robert-Jan DollCentre for Human Drug Research, Leiden, The Netherlands.
Frederik E StuurmanCentre for Human Drug Research, Leiden, The Netherlands.
Vasileios ExadaktylosCentre for Human Drug Research, Leiden, The Netherlands.
Gertjan J A DriessenJuliana Children's Hospital, HAGA Teaching Hospital, The Hague, The Netherlands.
Adam F CohenCentre for Human Drug Research, Leiden, The Netherlands.
Centre for Human Drug Research · NLLeiden University Medical Center · NLHaga Hospital · NLMaastricht University Medical Centre · NL

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

introductionCoughing is a common symptom in pediatric lung disease and cough frequency has been shown to be correlated to disease activity in several conditions. Automated cough detection could provide a noninvasive digital biomarker for pediatric clinical trials or care. The aim of this study was to develop a smartphone-based algorithm that objectively and automatically counts cough sounds of children.

methodsThe training set was composed of 3228 pediatric cough sounds and 480,780 noncough sounds from various publicly available sources and continuous sound recordings of 7 patients admitted due to respiratory disease. A Gradient Boost Classifier was fitted on the training data, which was subsequently validated on recordings from 14 additional patients aged 0-14 admitted to the pediatric ward due to respiratory disease. The robustness of the algorithm was investigated by repeatedly classifying a recording with the smartphone-based algorithm during various conditions.

resultsThe final algorithm obtained an accuracy of 99.7%, sensitivity of 47.6%, specificity of 99.96%, positive predictive value of 82.2% and negative predictive value 99.8% in the validation dataset. The correlation coefficient between manual- and automated cough counts in the validation dataset was 0.97 (p < .001). The intra- and interdevice reliability of the algorithm was adequate, and the algorithm performed best at an unobstructed distance of 0.5-1 m from the audio source.

conclusionThis novel smartphone-based pediatric cough detection application can be used for longitudinal follow-up in clinical care or as digital endpoint in clinical trials.

Indexed as

Respiration DisordersRespiratory Tract DiseasesAlgorithmsChildCoughHumansReproducibility of ResultsSmartphonealgorithmasthmacoughdetectionlung diseasemachine-learningpediatrics

Identifiers

PMID34964557
PMCPMC9306830
OpenAlexW4200277003

What OpenQuestion holds

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LicenceCC BY-NC
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.