Table V.

Use of Medicare Services Beginning at Age 65 By Insurance Status Prior to Age 65: Sensitivity Analysis

HRS-Medicare	Difference Relative to Privately Insured
Definition of "Uninsured"	At age 63 or 64	Always, Tranferred from Private Insurance in 1992 to Uninsured, or Transferred from Uninsured in 1992 to Private Insurance				Left Plus Transitioned from Uninsured in 1992 to Public Insurance
Definition of "Privately Insured"	At age 63 or 64	Always Privately Insured				Left Plus Transitioned from Private in 1992 to Public Insurance
Column	(1)	(2)	(3)	(4)	(5)	(6)	(7)	(8)
McWilliams et al. (2009) inverse probability weighting	No	No	No	No	Yes	Yes	No	No
Adjusted for covariates in Table 2	Yes	Yes	Yes	No	No	No	No	Yes
Adjustment includes stratum effects	No	No	Yes	Yes	Yes	Yes	Yes	Yes
Expenditures	−88.50 [386.30]	−443.15 [289.01]	−334.37 [293.34]	579.19** [273.63]	601.91** [272.44]	1146.69*** [287.51]	1127.21*** [287.53]	−42.16 [293.47]
Inpatient Stays	0.04* [0.02]	−0.01 [0.02]	−0.01 [0.01]	0.04*** [0.01]	0.04*** [0.01]	0.05*** [0.01]	0.05*** [0.01]	0.00 [0.01]
Physician Visits	−1.07*** [0.34]	−0.53*** [0.14]	−0.56*** [0.13]	−0.21* [0.13]	−0.12 [0.13]	0.01 [0.12]	−0.07 [0.12]	−0.52*** [0.13]
Person years uninsured	2,398	4,918	4,918	4,918	4,918	5,749	5,749	5,749
Person years insured	14,589	15,527	15,527	15,527	15,527	15,527	15,527	15,527

Adjusted differences consist of marginal effects from a generalized linear model using a log link and, for expenditures, a gamma distribution and for visit/stay counts, a negative binomial. Standard errors are in brackets. Covariates from Table 2 include gender, marital status, race, education and income categories, health status, dummies for census division, and year effects.

Although not reported, analyses in the first column of this table include a separate category for those publicly insured at ages 63 or 64, and analyses in subsequent columns include a separate category for those publicly insured in 1992.