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KMID : 1130320170600110373
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Korean Journal of Pediatrics
2017 Volume.60 No. 11 p.373 ~ p.378
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A comparative study of established z score models for coronary artery diameters in 181 healthy Korean children
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Ryu Kyung-Guk
Yu Jeong-Jin
Jun Hyun-Ok
Shin Eun-Jung
Heo Young-Hee
Baek Jae-Suk
Kim Young-Hwue
Ko Jae-Kon
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Abstract
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Purpose: The aim of this study was to investigate the statistical properties of four previously developed pediatric coronary artery z score models in healthy Korean children.
Methods: The study subjects were 181 healthy Korean children, whose age ranged from 1 month to 15 years. The diameter of each coronary artery was measured using 2-dimensional echocardiography and converted to the z score in the four models (McCrindle, Olivieri, Dallaire, and Japanese model). Descriptive statistical analyses and 1-sample t tests were performed.
Results: All calculated z scores had P values of ≥0.050 using the Kolmogorov-Smirnov test. The one sample t test showed that the mean z scores did not converge to zero except in 1 model, and the mean right coronary artery (RCA) z score was less than zero in all 4 models. The smaller RCA diameter in this study could be associated with the more distal measuring point used to avoid the conal branch. The percentage of subjects with extreme z score values (≥2.0 and ≥2.5) for the left main coronary artery (LMCA) seems to be higher in the Dallaire (4.9% and 3.3%) and Japanese models (7.1% and 3.8%).
Conclusion: All 4 models showed statistical feasibility of normal distribution. More precise instructions would be needed for the measurement of the RCA. The higher percentage of extreme z scores for the LMCA is compatible with the basic understanding of anatomic variation in the LMCA.
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KEYWORD
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z score, Coronary artery diameters, Korean children, Kawasaki disease
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