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Table 3 Differences in mean effect on treated patients in terms of survival years according to the matching algorithm

From: Effect of renal support therapy on 5-year survival in patients discharged from the intensive care unit

Matching method Difference RRT years 95% CI Bootstrap B* Treated RRT Controls no RRT Mortality HR (95% CI) Difference 5-year mortality %
Nearest neighbor
 1 − 1.85 (− 2.03 to − 1.64) 9.2 4366 2302 2.27 (2.0 to 2.5) 27.5 (24.9 to 30.2)
 5 − 1.78 (− 2.00 to − 1.62) 10.4 4366 10,812 2.3 (2.2 to 2.5) 27.5 (23.9 to 31.2)
 10 − 1.76 (− 1.98 to − 1.64) 11.4 4366 20,011 2.3 (2.2 to 2.4) 27.6 (23.7 to 31.5)
Maximum caliper distance
 0.01 − 1.86 (− 2.01 to − 1.65) 6.1 4354 2,301 2.46 (2.37 to 2.56) 24.5 (20.7 to 28.3)
 0.05 − 2.15 (− 2.02 to − 1.64) 43.9 4366 2283 2.31 (2.06 to 2.59) 26.3 (22.5 to 30.1)
 Kernel − 2.13 (− 2.01 to − 1.66) 41.7 4366 145,864 2.88 (2.77 to 2.99) 26.2 (22.8 to 29.5)
  1. *if B > 25%