Table 6.

Decomposition of Gains in Survival Over Time

Condition	(1)	(2)	(3)	(4)	(5)	(6)
	Contributions in Pctage Points			Contributions as Share of Total
	AMI	HF	Pneu	AMI	HF	Pneu
Total Change in Wtd Survival	0.0389	0.0092	0.0316	1.00	1.00	1.00
Within	0.0298	0.0076	0.0297	0.77	0.82	0.94
Between	0.0000	−0.0004	−0.0004	0.00	−0.05	−0.01
Cross	0.0062	0.0015	0.0015	0.16	0.16	0.05
Entry	0.0021	0.0006	0.0010	0.05	0.07	0.03
Exit	−0.0007	0.0000	0.0002	−0.02	0.01	0.01

This table decomposes the gains in risk-adjusted survival for the emergent conditions over our full sample window (between 1996 and 2008) using the decomposition shown in equation (7). Columns 1-3 show the contribution of each component to gains in survival in percentage points (e.g. a value of 0.1 is 10 percentage points). Columns 4-6 show the share of total gains that can be attributed to each component. The exit component enters negatively, so a negative value indicates that exit accounts for a gain in survival.

The decomposition is performed for each market, then averaged together weighted by the market's size in 1996. Risk-adjusted survival is calculated from a regression of survival on hospital fixed effects and patient risk-adjusters. A separate regression is run for each of the year groups 1994-1996 (yielding the 1996 survival rates) and 2006-2008 (yielding the 2008 survival rates).