Table 1

Sociodemographic characteristics of the study population before propensity score matching

Category	Depression (1824)		Non-depression (374 852)		P value†
	Before matching		Before matching
	n^*	%	n^*	%
Sex
Men	501	27.5	153 521	41	<0.001**
Women	1323	72.5	221 331	59	<0.001**
Age (years)
≤44	741	40.6	240 225	64.1
45–64	801	43.9	102 545	27.4	<0.001**
≥65	282	15.5	32 082	8.6	<0.001**
Income
Low (0–3)	307	16.8	67 379	18	<0.001**
Middle (4–7)	643	35.3	144 560	38.5
High (8–10)	874	47.9	162 913	43.5
CCI score
0	742	40.7	229 980	61.4	<0.001**
1	766	42	116 136	31
2	228	12.5	21 722	5.8
≥3	88	4.8	7014	1.9
Disability type
Non-disabled (0)	1757	96.3	365 088	97.4	0.016
Disabled (1)	67	3.7	9764	2.6	0.016
Region
Seoul (0)	389	21.3	64 661	17.3	<0.001**
Metropolitan cities (1)	424	23.3	98 986	26.4
Non-metropolitan cities (2)	1011	55.4	211 205	56.3

*P<0.05; **P<0.01.
†P for trend: χ² and analysis of variance.
CCI, Charlson Comorbidity Index.