Table 3.

Subgroup analysis

		Drug purchase	95% CI	Bandwidth (Sample size)	Inpatient	95% CI	Bandwidth (Sample size)	Outpatient	95% CI	Bandwidth (Sample size)
Depression	Not depression	0.276*	[-0.050, 0.602]	3.227	0.060	[-0.135, 0.257]	3.367	0.243	[-0.190, 0.676]	2.210
		(0.166)		(422; 649)	(0.100)		(432; 681)	(0.221)		(317; 434)
	Depression	0.182	[-0.123, 0.488]	3.254	0.145	[-0.080, 0.370]	3.789	0.034	[-0.224, 0.293]	3.248
		(0.156)		(301; 490)	(0.115)		(341; 565)	(0.132)		(296; 470)
Self-rated Health	Moderate or Healthy	0.270*	[-0.027, 0.567]	3.029	0.024	[-0.114, 0.163]	3.675	0.149	[-0.098, 0.397]	2.694
		(0.152)		(472; 686)	(0.070)		(556; 841)	(0.126)		(443; 575)
	Bad	0.222	[-0.256, 0.701]	2.804	0.281	[-0.117, 0.680]	3.101	0.053	[-0.325, 0.432]	3.071
		(0.244)		(207; 327)	(0.202)		(214; 379)	(0.193)		(213; 363)
Chronic diseases	No chronic diseases	0.251*	[-0.030, 0.532]	3.481	0.002	[-0.126, 0.131]	4.279	-0.029	[-0.365, 0.306]	2.295
		(0.143)		(442; 683)	(0.066)		(558; 824)	(0.171)		(333; 418)
	Otherwise	0.162	[-0.175, 0.499]	3.097	0.180	[-0.079, 0.440]	3.593	0.156	[-0.085, 0.397]	3.960
		(0.172)		(285; 480)	(0.132)		(324; 557)	(0.123)		(359; 611)
Income (net of pension)	Low	0.488**	[0.038, 0.937]	2.632	0.270*	[-0.143, 0.345]	3.029	0.270*	[-0.090, 0.645]	3.029
		(0.229)		(667; 928)	(0.152)		(472; 686)	(0.152)		(472; 686)
	High	-0.013	[-0.225, 0.198]	4.537	0.077	[-0.098, 0.253]	4.062	-0.026	[-0.175, 0.122]	4.629
		(0.108)		(514; 757)	(0.089)		(424; 696)	(0.076)		(528; 764)

Robust criteria errors for clustering to the individual level are reported in parentheses, *p < 0.1, **p < 0.05