Table 3.

Proportion of Variation in Mortality Explained by Individual Patient Factors Included in the Model

Patient Factor	Variation Explained (%)
Age/prematurity status	17.5
STAT score	13.4
Preoperative mechanical ventilation	12.0
Other preoperative factors	6.8
Weight at surgery	4.2
Preoperative shock	4.2
Any chromosomal abnormality/syndrome	2.7
Preoperative mechanical circulatory support	2.6

Assessed by constructing a series of models as described in the methods in which only 1 of the patient factors was included at a time and the variance partitioning analysis was repeated; for this reason the sum, does not add up to 30%, as in the overall model described in Table 2.

STAT, The Society of Thoracic Surgeons–European Association for Cardio-Thoracic Surgery.