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Table 3 Baseline characteristics of the Marfan syndrome patients and control group and balancing tests pre and post genetic matching

From: The economic impact of Marfan syndrome: a non-experimental, retrospective, population-based matched cohort study

Variables Marfan Control aD-statistic bp-value
Sample size (N)     
  before matching 892 26,645
  after matching 892 892
Mean age (years)     
  before matching 28.95 50.50 0.389 <0.001
  after matching 28.95 28.90 0.002 0.996
% female     
  before matching 40.70 50.45 <0.001
  after matching 40.70 40.70 1
Mean propensity score     
  before matching 0.116 0.029 0.470 0.002
  after matching 0.116 0.116 0.002 0.999
Elixhauser comorbidities     
  before matching 15 of 29 significantly different at p < 0.05
  after matching 0 of 29 significantly different at p < 0.05
Pharmacy-based classes     
  before matching 16 of 30 significantly different at p < 0.05
  after matching 0 of 30 significantly different at p < 0.05
  1. aD-statistic represents the maximum difference in the empirical cumulative distribution function (eQQ statistic).
  2. bp-value: paired t-test for dichotomous and KS test for continuous variables.