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Table 1 Comparison of characteristic between COVID-19 patients and control group in South Korea in 2020

From: Socioeconomic disparity and the risk of contracting COVID-19 in South Korea: an NHIS-COVID-19 database cohort study

Variable Control COVID-19 P-value
n = 114,371 n = 7669
Age    0.998
 20–29 30,306 (26.5) 2051 (26.7)  
 30–39 12,238 (10.7) 828 (10.8)  
 40–49 15,391 (13.5) 1029 (13.4)  
 50–59 23,282 (20.4) 1558 (20.3)  
 60–69 17,869 (15.6) 1186 (15.5)  
 70–79 9223 (8.1) 613 (8.0)  
 ≥ 80 6062 (5.3) 404 (5.3)  
Sex, male 45,094 (39.4) 3024 (39.4) 1.00
Residence at Februrary, 2020    0.993
 Seoul 7481 (6.5) 507 (6.6)  
 Gyeonggi-do 74,931 (65.5) 5012 (65.4)  
 Daegu 6320 (5.5) 418 (5.5)  
 Gyeongsangbuk-do 13,816 (12.1) 932 (12.2)  
 Other area 11,823 (10.3) 800 (10.4)  
Underlying disability 6566 (5.7) 608 (7.9) < 0.001
Grade of disability    < 0.001
 Severe 2221 (1.9) 291 (3.8)  
 Mild to moderate 4345 (3.8) 317 (4.1)  
Type of disability    < 0.001
 No disability 107,805 (94.3) 7061 (92.1)  
 Physical disability 2854 (2.5) 214 (2.8)  
 Brain lesion disability 649 (0.6) 72 (0.9)  
 Visual disturbance 656 (0.6) 39 (0.5)  
 Hearing disability 1185 (1.0) 102 (1.3)  
 Other disability 1222 (1.1) 181 (2.4)  
Income level in 2020 (Feb)    < 0.001
 Q1 (Lowest) 29,272 (25.6) 2428 (31.7)  
 Q2 23,190 (20.3) 1441 (18.8)  
 Q3 25,761 (22.5) 1554 (20.3)  
 Q4 (Highest) 34,177 (29.9) 2130 (27.8)  
 unknown 1971 (1.7) 116 (1.5)  
Average Income level (2015–2020)    < 0.001
 Q1 (Lowest) 13,363 (11.7) 961 (12.5)  
 Q2 29,932 (26.2) 2016 (26.3)  
 Q3 30,275 (26.5) 1814 (23.7)  
 Q4 (Highest) 30,221 (26.4) 1879 (24.5)  
 unknown 10,580 (9.3) 999 (13.0)  
Charlson comorbidity index 2020 1.7 (2.8) 3.3 (3.5) < 0.001
 Peripheral vascular disease 6311 (5.5) 454 (5.9) 0.143
 Renal disease 1138 (1.0) 132 (1.7) < 0.001
 Rheumatic disease 1936 (1.7) 232 (3.0) < 0.001
 Dementia 3233 (2.8) 418 (5.5) < 0.001
 Peptic ulcer disease 8417 (7.4) 1014 (13.2) < 0.001
 DM without chronic complication 11,511 (10.1) 1578 (20.6) < 0.001
 Hemiplegia or paraplegia 434 (0.4) 104 (1.4) < 0.001
 Moderate or severe liver disease 121 (0.1) 15 (0.2) 0.035
 Mild liver disease 11,296 (9.9) 1745 (22.8) < 0.001
 Chronic pulmonary disease 11,094 (9.7) 2454 (32.0) < 0.001
 DM with chronic complication 3656 (3.2) 303 (4.0) < 0.001
 Cerebrovascular disease 4926 (4.3) 478 (6.2) < 0.001
 Congestive heart failure 2792 (2.4) 668 (8.7) < 0.001
 Myocardial infarction 755 (0.7) 344 (4.5) < 0.001
 Metastatic solid tumor 18,847 (16.5) 2341 (30.5) < 0.001
 Malignancy 3524 (3.1) 332 (4.3) < 0.001
 AIDS/HIV 22 (0.0) 10 (0.1) < 0.001
  1. Presented as mean with standard deviation or number with percentage
  2. DM diabetes mellitus, AIDS acquired immune deficiency syndrome, HIV Human Immunodeficiency Virus