. 2021 Aug 30;51(4):2127–2135. doi: 10.3906/sag-2012-151

Table 2.

The 2x2 contingency table presenting 28-day survival statuses of ECCO2R vs. conventional treated-alone COPD and ARDS patients, comparisons, and statistical calculations. Statistical p values, RRR, ARR, and ORs with 95% CIs.

		Survived (n)	Ex (n)	p	RRR	ARR	OR	NNT
TOTAL	ECCO2R	51 (68%)	24 (32%)	0.025	0.16(0.03–0.39)	0.10(0.02–0.21)	1.5(0.9–2.6)	10
TOTAL	Control	187 (58%)	133 (42%)	0.025	0.16(0.03–0.39)	0.10(0.02–0.21)	1.5(0.9–2.6)	10
COPD	ECCO2R	32 (65%)	17 (35%)	0.036	0.20(0.06–0.52)	0.11(0.04–0.25)	1.6(0.8–3.0)	9
COPD	Control	113 (55%)	94 (45%)	0.036	0.20(0.06–0.52)	0.11(0.04–0.25)	1.6(0.8–3.0)	9
ARDS	ECCO2R	19 (73%)	7 (27%)	0.042	0.12(0.02–0.46)	0.08(0.03–0.12)	1.4(0.6–3.7)	13
ARDS	Control	74 (65%)	39 (35%)	0.042	0.12(0.02–0.46)	0.08(0.03–0.12)	1.4(0.6–3.7)	13

ECCO2R; extracorporeal CO2 removal, COPD; chronic obstructive pulmonary disease, ARDS; acute respiratory distress syndrome, RRR; relative risk reduction, ARR; absolute risk reduction, NNT; number need to treat, OR; odds ratio, CI; confidence intervals.