TABLE 4.

Decomposition of pre-post KAS DGF rate for young pediatric recipients

	Odds ratio of DGF (post-KAS vs pre-KAS)	95% CI	% Odds difference explained, cumulative
Sample (N = 1143)	1.68	(1.06-2.66)	–
Weighted by donor age/size (N = 1138)	1.52	(0.95-3.46)	24%
Weighted by donor age/size and duration of recipient dialysis (N = 1138)	1.37	(0.90-2.66)	43%

Semiparametric decomposition of the increased odds of DGF post-KAS via the DiNardo, Fortin, and Lemieux method. This method uses a propensity score and inverse probability weighting to estimate the counterfactual outcome if post-KAS recipients had received kidneys from the same donors with the same amount of dialysis time as pre-KAS recipients. Each row represents a set of variables added to the propensity score and the resulting reduction in the odds of DGF can be interpreted as the percent of the post-KAS DGF explained by the variables. See Figure 5 and Table S3 for balancing of covariates in the final model. Donor size variables included age, height, weight, and BMI.