Table 4.

Comparison between the preoperative Z-score mean of pulmonary artery and the postoperative Z-score mean of aortic annulus of the simple TGA and complex TGA groups

Z-score (Complex TGA)	Mean ± standard-deviation	Difference between the means	Paired t test	P value
Pre	1.9 ± 1.1	-0.3 ± 0.4	4.88	< 0.0001
Post	2.2 ± 1.3
Z-score (Simple TGA)	Mean ± standard-deviation	Difference between the means	Paired t test	P value
Pre	1.6 ± 0.7	-0.2 ± 0.3	4.81	< 0.0001
Post	1.8 ± 1.0

*p < 0.0001