Table 4.

Extrapolation of key results to national epidemiological data

						If WLST-N<72 were eliminated:
EMS-treated out-of-hospital cardiac arrests	→	Surviving to hospital	→	Exposed to WLST-N<72	Predicted outcome without exposure	Lives annually	% Improvement in outcomes
321 mil × 52.1/100K[18] = 167,000	×	0.25[17] = 41,750	×	0.22 = 9,185	Survival
					Propensity match: 0.25 (0.22 –0.28)	2,296 (2,021– 2,572)	5.5% (4.8% – 6.2%)
					Logistic regression model: 0.26 (0.23 – 1.0)	2,388 (2,113 – 9,185)	5.7% (5.1% – 100%)
					Favorable outcome
					Propensity match: 0.16 (0.14 – 0.19)	1,470 (1,286 – 1,745)	3.5% (3.1% – 4.2%)
					Logistic regression model: 0.16 (0.14 – 1.0)	1,470 (1,286 – 9,185)	3.5% (3.1% – 100%)

Abbreviations: EMS – Emergency medical services; WLST-N<72 - Withdrawal of life-sustaining therapy because of perceived neurological injury and assumed poor prognosis before 72 hours of return of spontaneous circulation