End-tidal carbon dioxide monitoring may be associated with a higher possibility of return of spontaneous circulation during out-of-hospital cardiac arrest: a population-based study

Table 4 Comparison of ORs and risk differences among the original group and matched cohorts

		ETCO2 group (n)	Untreated group (n)	ORs (95 % CI)	Risk differences (95 % CI)
Original group	ROSC(+)	25	633	2.95 (1.83–4.74)	0.17 (0.07–0.27)
Original group	ROSC(−)	58	4325	2.95 (1.83–4.74)	0.17 (0.07–0.27)
1:4 matched cohort	ROSC(+)	25	56	2.12 (1.23–3.68)	0.13 (0.02–0.23)
1:4 matched cohort	ROSC(−)	58	276	2.12 (1.23–3.68)	0.13 (0.02–0.23)
1:20 matched cohort	ROSC(+)	15	150	2.39 (1.29–4.46)	0.14 (0.02–0.26)
1:20 matched cohort	ROSC(−)	38	910	2.39 (1.29–4.46)	0.14 (0.02–0.26)

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