. Author manuscript; available in PMC: 2018 May 11.

Published in final edited form as: Rev Econ Stat. 2018 Mar 2;100(1):29–44. doi: 10.1162/REST_a_00670

Table 5.

Patient Travel and Proximity Effects

	Dependent Variables
	Travel		New Drug Use
Independent Variables	(1)	(2)	(3)	(4)
First author HRR	0.0329^* (0.0192)	0.0309^* (0.0197)	0.0327^*** (0.0124)	0.0311^*** (0.0116)
Traveler to first author HRR			0.0224 (0.0140)	0.0226 (0.0138)
Other author HRR	0.0295^*** (0.0094)	0.0285^*** (0.0089)	0.0066 (0.0052)	0.0064 (0.0056)
Traveler to other author HRR			0.0012 (0.0061)	0.0011 (0.0064)
Sample
Author HRRs only?	No	Yes	No	Yes
Number of observations	659,468	286,637	659,468	286,637

Columns 1 and 2 report results from regressions where the dependent variable indicates whether the patient received care outside his or her HRR of residence. Columns 3 and 4 report results from regressions where the dependent variable indicates whether the patient received treatment with the new drug. Columns 2 and 4 restrict the sample to regions that contain a study author for at least one drug in our sample. See notes to table 3.

p < 0.10,

^**

p < 0.05, and

^***

p < 0.01.