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. Author manuscript; available in PMC: 2020 Oct 7.

Published in final edited form as: Manage Sci. 2018 Feb 5;64(12):5461–5480. doi: 10.1287/mnsc.2017.2900

Table 3.

Difference-in-Differences Estimates from Full and Matched Samples on Visit Frequency

	Full diff-in-diff		LDL match		HbA1c match
	(1) Office	(2) Phone	(3) Office	(4) Phone	(5) Office	(6) Phone

Patient E-Visit Adoption	0.010^***	0.017^***	0.011^***	0.026^***	0.013^**	0.043^***
	(0.002)	(0.004)	(0.003)	(0.006)	(0.005)	(0.012)
Patient FEs	✓	✓	✓	✓	✓	✓
Provider FEs	✓	✓	✓	✓	✓	✓
Month FEs	✓	✓	✓	✓	✓	✓
Year FEs	✓	✓	✓	✓	✓	✓
Mean of dep. var.	0.16	0.24	0.19	0.30	0.23	0.37
R²	0.002	0.001	0.003	0.002	0.004	0.003
Sample	All	All	Matched	Matched	Matched	Matched
			(LDL)	(LDL)	(HbA1c)	(HbA1c)
Patient-months	5,948,239	5,948,239	818,184	818,184	254,094	254,094

Note. Standard errors in parentheses are robust and two-way clustered at the patient and the provider-month levels.

^*

p < 0.10

^**

p < 0.05

^***

p < 0.01.