Table 5.

The variability of calculated z scores according to various z score formulas^a)

	Absolute value of LAD	Z score formula
		McCrindle et al. [36]	Olivieri et al. [37]	Dallaire and Dahdah [38]	Kobayashi et al. [39]	Lopez et al. [40]
2-year-old boy, 13 kg, 90 cm	2.5 mm	2.57	1.93	2.71	2.22	3.85
	4 mm	8.31	4.52	7.06	4.86	9.52
	8 mm	23.64	8.33	18.67	8.87	24.62
5-year-old boy, 19 kg, 110 cm	3 mm	3.11	2.30	3.16	252	4.38
	4 mm	6.46	3.88	5.85	4.25	7.71
	8 mm	19.86	7.69	16.63	8.81	21.00

LAD, left anterior descending coronary artery.

^a)Using Microsoft Excel-based z score calculator available at: http://raise.umin.jp/zsp/calculator/.