Table 3. Results of the subgroup analyses according to subjects’ income.

Variables		Income
		Low		Middle		High
		% (95% CI)	P value	% (95% CI)	P value	% (95% CI)	P value
Inpatient cost
	Case group 1	45.15 (20.38, 75.03)	< 0.001	7.44 (−10.34, 28.76)	0.436	7.89 (−5.48, 23.15)	0.261
	Case group 2	11.53 (−7.72, 34.77)	0.258	−7.13 (−23.24, 12.36)	0.446	−4.60 (−16.45, 8.92)	0.485
	Case group 3	30.54 (8.36, 57.27)	0.005	2.94 (−15.17, 24.92)	0.769	0.53 (−11.92, 14.74)	0.937
Inpatient admission
	Case group 1	17.02 (5.19, 30.19)	0.003	4.40 (−6.47, 16.53)	0.442	6.18 (−1.69, 14.67)	0.126
	Case group 2	0.92 (−7.96, 10.66)	0.844	−3.08 (−11.64, 6.31)	0.507	−2.14 (−8.3, 4.43)	0.514
	Case group 3	7.34 (−1.57, 17.05)	0.108	−2.22 (−10.45, 6.76)	0.615	−1.23 (−7.05, 4.95)	0.688
Inpatient length of stay
	Case group 1	9.22 (−1.95, 21.66)	0.109	12.08 (0.87, 24.53)	0.033	11.52 (3.36, 20.32)	0.004
	Case group 2	−7.96 (−17.69, 2.94)	0.146	6.97 (−4.26, 19.51)	0.233	0.38 (−7.01, 8.37)	0.922
	Case group 3	12.14 (0.22, 25.47)	0.045	1.10 (−10, 13.56)	0.854	1.42 (−6.22, 9.68)	0.724
Outpatient cost
	Case group 1	−10.66 (−15.79, −5.23)	< 0.001	−9.29 (−13.36, −5.03)	< 0.001	−8.34 (−11.45, −5.13)	< 0.001
	Case group 2	−15.67 (−21.05, −9.91)	< 0.001	−6.11 (−11.41, −0.5)	0.033	−7.37 (−10.91, −3.71)	<0.001
	Case group 3	0.50 (−6.4, 7.91)	0.889	17.07 (8.81, 25.95)	< 0.001	1.22 (−3.34, 5.98)	0.607
Outpatient visits
	Case group 1	−8.68 (−12.25, −4.96)	< 0.001	−6.69 (−9.83, −3.42)	< 0.001	−6.34 (−8.65, −3.96)	< 0.001
	Case group 2	−7.36 (−11.14, −3.42)	<0.001	−8.67 (−12.21, −4.99)	< 0.001	−7.88 (−10.31, −5.39)	< 0.001
	Case group 3	−3.59 (−7.62, 0.62)	0.093	−3.19 (−7.33, 1.13)	0.145	−2.93 (−5.66, −0.11)	0.041
Total medical cost
	Case group 1	6.66 (−0.21, 14)	0.057	−3.97 (−9.03, 1.38)	0.143	−4.79 (−8.49, −0.96)	0.014
	Case group 2	−6.97 (−13.40, −0.05)	0.048	−6.64 (−12.46, −0.42)	0.036	−6.73 (−10.64, −2.65)	0.001
	Case group 3	10.82 (2.59, 19.7)	0.009	12.96 (4.38, 22.24)	0.002	0.61 (−4.29, 5.76)	0.811

CI = confidence interval.