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The ensemble‐averaged impedance cardiogram: An evaluation of scoring methods and interrater reliability
Author(s) -
Kelsey Robert M.,
Reiff Sarah,
Wiens Stefan,
Schneider Tamera R.,
Mezzacappa Elizabeth S.,
Guethlein William
Publication year - 1998
Publication title -
psychophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.661
H-Index - 156
eISSN - 1469-8986
pISSN - 0048-5772
DOI - 10.1017/s0048577298001310
Subject(s) - inter rater reliability , intraclass correlation , beat (acoustics) , psychology , concurrent validity , reliability (semiconductor) , audiology , statistics , physical medicine and rehabilitation , psychometrics , mathematics , medicine , developmental psychology , rating scale , power (physics) , physics , quantum mechanics , acoustics , internal consistency
The interrater reliability and concurrent validity of two methods of scoring the ensemble‐averaged impedance cardiogram were evaluated. Impedance cardiographic and electrocardiographic signals were recorded from 40 undergraduate men and women during a baseline rest period and a vocal mental arithmetic task period. Recordings were scored by four raters using a conventional method, involving ensemble averaging after careful editing of beat‐to‐beat waveforms, and a streamlined method, involving ensemble averaging without beat‐to‐beat editing. Intraclass correlations for interrater reliability exceeded .92, whereas intraclass correlations for concurrent validity exceeded .97, indicating excellent agreement between raters and scoring methods for all cardiac measures. The streamlined method was significantly faster than the conventional method. The results indicate that variations in beat‐to‐beat editing do not constitute a serious source of error in the ensemble‐averaged impedance cardiogram and support the interrater reliability and concurrent validity of the two scoring methods.