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Table 1 Before and after matching sample characteristics

From: Assessing the outcomes of implantable cardioverter defibrillator treatment in a real world setting: results from hospital record data

  Sub-sample 1 Sub-sample 2
  Before matching After-matching Before matching After-matching
  Mean case (sd) Mean control (sd) Standardized difference Mean case (sd) Mean control (sd) Standardized difference
Covariates       
Age 65.90 (12.02) 70.40 (10.09) −0.01 66.30 (10.58) 70.12 (9.83) −0.01
Gender (Female) 0.15 (0.35) 0.16 (90.38) 0 0.14 (0.35) 0.15 (0.35) 0
Charlston Index = 0     0.53 (0.49) 0.54 (0.50) 0
Charlston Index = 1     0.24 (0.43) 0.30 (0.46) 0
Charlston Index = 2     0.14 (0.35) 0.21 (0.41) 0
Outcomes       
LOS 9.15 (11.9) 9.05 (9.72) 0.152 8.86 (11.24) 9.07 (9.40) 0.154
Re-hospitalization rate 2.11 (3.51) 1.54 (2.52) 0.202 2.14(3.60) 1.57(2.42) 0.227
Mortality 0.29 (0.45) 0.47 (0.50) −0.109 0.30 (0.46) 0.46(0.50) −0.067
Expenditure for index hospitalisation (€) 15020.92 (5780.23) 4259.72 (5780.95) 1.44 14815.56 (7343.40) 4307.13(6443.55) 1.347
Total hospital expenditure during follow up (€) 24944.31 (19558.93) 10881.34 (13230.06) 0.156 24829.44 (19863.8) 11269.01 (14044.27) 0.618
Patients 1050 11976   905 5962  
  1. Legend: Sub-sample 1: ICD and non ICD patients with the same primary diagnosis (+ other controls); Sub-sample 2: ICD and non ICD patients with the same primary diagnosis and Charlson index (+ other controls; Case: Patients with ICD; Controls: Patients without ICD; Standardized difference = After-matching standardized differences between case and control groups; LOS = Length of Stay in day.