Table 4 –

Detailing Test: Within-DMA Total Utilization of Chronic Drugs

Dependent Variable:	# of Prescriptions
	Baseline	ZIP3 level	DMA x Qtr FE
	(1)	(2)	(3)
A. Instrument=Share65+ *Post
Share65+*Post (DMA level)	0.111*** (0.033)
Share65+*Post (ZIP3 level)		0.087*** (0.027)	0.015 (0.026)
B. Instrument=High Elderly Share *Post
High Elderly Share*Post (DMA level)	0.003**
	(0.002)
High Elderly Share*Post (ZIP3 level)		0.006***	0.002
		(0.002)	(0.002)
Mean of Dep. Var. (pre- Part D)	0.10	0.10	0.10
Zipcode x Condition x Quarter Obs	67,495	67,495	67,495

Notes:

^***p<0.01,

^**p<0.05,

^*p<0.1. Clustered standard errors at the 3-digit ZIP code level; all specifications include qtr fixed effects, 3-digit ZIP code fixed effects, condition fixed effects. Col 1: same as Table 2, but for sample of ZIP codes that are uniquely matched to one DMA, elderly share computed at the DMA-level; Col 2: elderly share computed at 3-digit ZIP code level; Col 3: adds DMA x quarter fixed effects, elderly share computed at 3-digit ZIP code level. Includes the 50 drugs that advertised during the study period for 5 chronic conditions: depression, diabetes, hyperlipidemia, hypertension, and osteoporosis.