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. 2012 Oct 22;48(3):1039–1056. doi: 10.1111/1475-6773.12006

Table 1.

Annual July Total Enrollment in Medicare Advantage Total and by County Medicare Population Quartiles, 1999–2008

Mean Total I II III IV
Base payment $655.76 ($94.12) 2.85*** (0.64) −0.10*** (0.03) −0.19*** (0.071) −0.40** (0.20) 9.47*** (2.38)
HCC 0.37 (0.40) 998.48*** (76.75) 60.07*** (4.53) 186.72*** (11.50) 499.95*** (26.87) 3,469.19***(298.94)
Part D and lock-in 0.30 (0.46) 442.26*** (28.87) 34.60*** (2.10) 98.07*** (4.85) 219.04*** (10.90) 1,453.76***(111.04)
Medicare pop 10,340 (27,618) 0.40*** (0.12) 0.07*** (0.01) 0.10*** (0.02) 0.15*** (0.03) 0.38***(0.12)
Time trend 5.5 (2.9) −217.60*** (23.81) −0.64 (0.82) −6.37*** (2.43) −24.74*** (6.04) −804.96***(85.21)
Constant −3,327.96*** (1,399.95) 10.59 (19.72) −64.59 (75.81) −248.99 (175.45) −9,061.85*(4,870.70)
County-fixed effects Yes Yes Yes Yes Yes
Adj. R2 0.983 0.650 0.764 0.838 0.981
N 30,390 30,390 7,556 7,799 7,779 7,256

Mean of annual enrollment = 1,950.0 (10,034.8).

*, **, *** indicate statistical significance at the 90, 95, and 99 percent confidence intervals, respectively.

Standard deviations (column 1) and standard errors are in parentheses.