Table 4. The variability of calculated Z scores according to various Z score formulas

	Absolute value of LAD	Z score formula
		McCrindle et al. [36]	Olivieri et al. [37]	Dallaire et al. [38]	Kobayashi et al. [39]	Lopez et al. [40]	Yu et al. [42]
2-year-old boy 13 kg, 90 cm	2.5 mm	2.57	1.93	2.71	2.22	3.85	2.25
	4 mm	8.31	4.52	7.06	4.86	9.52	5.28
	8 mm	23.64	8.33	18.67	8.87	24.62	9.76
5-year-old boy 19 kg, 110 cm	3 mm	3.11	2.30	3.16	2.52	4.38	2.59
	4 mm	6.46	3.88	5.85	4.25	7.71	4.45
	8 mm	19.86	7.69	16.63	8.81	21.00	8.92

Using Microsoft Excel–based Z score calculator (available at http://raise.umin.jp/zsp/calculator/).
LAD: left anterior descending coronary artery.