Table 3.

Weights and counterfactual weights from 2005 to 2010.

	2005	2006	2008	2009	2010	Total
2007 weights	1.149	1.355	1.302	1.302	1.310	1.291
	(0.000658)	(0.000636)	(0.000501)	(0.000509)	(0.000514)	(0.000248)
current yr weight	1.144	1.349	1.344	1.361	1.382	1.328
	(0.000676)	(0.000650)	(0.000502)	(0.000522)	(0.000527)	(0.000253)
change in weight	−0.00512	−0.00548	0.0418	0.0589	0.0722	0.0375
	(0.0000393)	(0.000103)	(0.000123)	(0.000172)	(0.000177)	(0.0000653)

Notes: The variable 2007 weight is the CMS-DRG weight the patient would have been assigned, if the patient had been admitted in 2007. The variable current year weight represents the DRG weight of the patient in the year they were admitted. The change in weight variable is row 2 minus row 1, and this measures the difference between the DRG weight which was assigned to the patient and the DRG weight that would have been assigned if the patient had been admitted in 2007. In parentheses are the standard errors of the mean: standard deviation / square root of sample size.