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Table 1 Baseline characteristics of study population

From: Increased risk of malignancy in patients with systemic lupus erythematosus: population-based cohort study in Korea

Variables SLE patients
(n=17,854)
General population
(n=649,010)
Age, years 42.3 ± 13.2 44.2 ± 16.1
Sex, female 16,143 (90.4) 306,649 (47.2)
Duration of observation, years 3.4 ± 0.9 3.7 ± 0.6
Payer type   
 National health insurance 16,752 (93.8) 630,446 (71.1)
 Medical aid 1102 (6.2) 18,564 (2.9)
Type of institution   
 Tertiary hospital 12,362 (69.2) 15,059 (2.3)
 General hospital 3837 (21.5) 30,927 (4.8)
 Community hospital 146 (0.8) 36,687 (5.6)
 Clinic 1377 (7.7) 239,369 (36.9)
 Other 132 (0.7) 326,968 (50.4)
Number of comorbidities 1.2 ± 0.6 0.1 ± 0.3
Comorbidity   
 Myocardial infarction 21 (0.1) 468 (0.07)
 Congestive heart failure 162 (0.9) 1437 (0.2)
 Peripheral vascular disease 512 (2.9) 4280 (0.7)
 Cerebrovascular disease 253 (1.4) 3733 (0.6)
 Dementia 38 (0.2) 132 (0.02)
 Chronic pulmonary disease 492 (2.8) 12,724 (2.0)
 Peptic ulcer disease 1084 (6.1) 10,119 (1.6)
 Mild liver disease 920 (5.2) 7558 (1.2)
 Diabetes mellitus 601 (3.4) 13,323 (2.1)
 Hemiplegia or paraplegia 51 (0.3) 685 (0.1)
 Renal disease 474 (2.7) 1,180 (0.2)
 Moderate or severe liver disease 11 (0.1) 157 (0.02)
Charlson Comorbidity Index score 0.30 ± 0.69 0.10 ± 0.40
  1. Numerical quantitative data were presented by “mean ± SD” and categorical data were presented by “frequency (%)”