Table 1.

Regression Table for Buprenorphine Prescribed Per Capita in 3-Digit Zip Code Areas, 2015 and 2017

	(1)		(2)
	Coefficient (95% CI)	P	Coefficient (95% CI)	P
Certified providers per cap (any limit)	9.07 (3.53 to 14.60)	0.001	− 0.6 (− 6.53 to 5.33)	0.843
Certified MDs per cap (100 patients)			21.95 (5.84 to 38.05)	0.008
Certified MDs per cap (275 patients)			111.10 (90.51 to 131.70)	< 0.001
Certified NPs/PAs per cap (30 patients)			114.75 (− 43.29 to 272.78)	0.154
Number of Obs	1,768		1,768

Each column of results is obtained from a separate regression in which the dependent variable is always the buprenorphine prescribed in the area in the year, and the key regressor is as noted in the row (different ways of measuring the number of certified providers). Buprenorphine in grams for each 3-digit zip code area is from Automation of Reports and Consolidated Orders System (ARCOS). Numbers of certified providers were aggregated to 3-digit zip code level from Drug Enforcement Agency (DEA) provider lists. We also controlled for state-by-year fixed effects and 3-digit zip code fixed effects. A constant was also included in regressions

MD medical doctor, NP nurse practitioner, PA physician assistant