Emergency coronary artery bypass grafting using minimized versus standard extracorporeal circulation – a propensity score analysis

Table 3 Estimated average treatment effects on several outcome variables

Comparison	Outcome measures
ATT^A	30-day mortality [%]	ICU-stay [days]	Hospital stay [days]	Low cardiac output [%]
CECC versus MECC
CECC (n=175)	14.8	5.3	13	11.4
MECC (n=146)	6.9	4.6	12	5.6
Unadjusted mean difference	−7.9	−0.8	−1	−5.8
p-value	0.03^B	0.11	0.80	0.07^B
Adjusted mean difference after matching of 100 pairs (95% bias corrected CI)	−1.0 (−8.6 to 7.6)	1.0 (−0.21 to 3.24)	1.0 (−2 to 3.6)	−1.1 (−7.3 to 7.1)
p-value	1.0^C	0.70^F	0.40^F	0.83^C
ATE^D
Adjusted mean difference with 95% bias corrected CI)	−1.5 (−8.1 to 5.8)^E	0.61 (−0.7 to 2.2)^E	0.34 (−2.5 to 2.6)^E	−1.7 (−7.1 to 6.5)^E

^A – ATT Average treatment effect for the Treated.
^B – Fisher’s exact test.
^C – McNemar’s test.
^D – ATE Average treatment effect.
^E – The 95% bias corrected confidence interval does include a zero, or p > 0.05 for a two-tailed test.
^F – Wilcoxon’s signed rank test.

ISSN: 1749-8090