Table 7.

Regression results adenoid and tonsils

	Dependent variable
	Quality
	Pooled	Pooled	Fixed effects	Fixed effects	Random effects	Random effects
	(1)	(2)	(3)	(4)	(5)	(6)
Constant	−0.008	0.292			−0.089	−0.064
	(0.236)	(0.902)			(0.283)	(0.804)
ms	0.011	−0.068	0.723	0.382	0.099	−0.034
	(0.323)	(0.562)	(1.537)	(1.639)	(0.383)	(0.514)
frac_female		−0.388		−0.191		−0.101
		(1.452)		(1.158)		(1.215)
frac_65		−19.167		4.575		−17.188
		(25.528)		(19.921)		(23.471)
Com		0.257		0.379		0.304
		(0.198)		(0.422)		(0.201)
HHI_ins		−0.579		1.394		−0.233
		(0.602)		(1.915)		(0.608)
Lowvolume		−0.185		0.036		−0.156
		(0.231)		(0.182)		(0.178)
Acad		−0.224				−0.228
		(0.311)				(0.314)
Observations	191	191	191	191	191	191
R${}^2$	0.00001	0.066	0.002	0.015	0.002	0.038
Adjusted R${}^2$	0.00001	0.063	0.001	0.008	0.002	0.036

* $p<0.1$; ** $p<0.05$; *** $p<0.01$. We report the results from the pooled, fixed-effects, and random-effects model. For each model, we report two variants: (i) a simple model with the weighted market share regressed on the average scaled quality indicator and (ii) a model with additional control variables. We report the MacKinnon and White Heteroskedasticity-Consistent standard errors (in parentheses under coefficients). We used data from the period 2008–2011