. Author manuscript; available in PMC: 2015 Apr 23.

Published in final edited form as: Am Econ Rev. 2015 Mar;105(3):1030–1066. doi: 10.1257/aer.20130758

Table 4.

Difference-in-Differences Regression Results

	(1) Coverage	(2) Log Premium	(3) Log Claim Exp
γ^k MA^* After	0.305^*** [0.205, 0.402]	-0.266^*** [-0.319, -0.213]	-0.099^*** [-0.157, -0.033]
$ρ_{1}^{k}$ MA^* During	-0.012 [-0.048, 0.022]	-0.028 [-0.082, 0.028]	-0.051 [-0.110, 0.012]
$ρ_{2}^{k}$ MA	0.154^** [0.018, 0.301]	0.559^*** [0.497, 0.626]	0.609^*** [0.539, 0.682]
$ρ_{3}^{k}$ After	-0.084^* [-0.182, 0.016]	0.161^*** [0.109, 0.214]	0.225^*** [0.159, 0.282]
$ρ_{4}^{k}$ During	-0.021 [-0.054, 0.015]	0.103^*** [0.047, 0.157]	0.188^*** [0.125, 0.247]
$ρ_{11}^{k}$ Constant	0.549^*** [0.403, 0.682]	8.119^*** [8.052, 8.180]	7.960^*** [7.887, 8.030]

Pre-Reform Value (levels)	0.703	5,871.33	5,270.64

The bootsrapped 95% confidence interval is displayed in brackets.

Standard errors are clustered at the state level. Abadie weights depend on member month enrollment, an indcator variable that takes on the value of one for guaranteed issue states as well as changes in coverage, relative changes in average costs, and relative changes in premiums between 2004 and 2005.

p < 0.10,

^**

p < 0.05,

^***

p < 0.01