Table 2.
Comparison of of characteristics between CRD group and control group
| Variable | CRD n = 36,365 | Control n = 87,965 | P value |
|---|---|---|---|
| Age, year | < 0.001 | ||
| 20–29 | 6932 (19.1) | 25,448 (28.9) | |
| 30–39 | 3451 (9.5) | 9703 (11.0) | |
| 40–49 | 4503 (12.4) | 12,016 (13.7) | |
| 50–59 | 6787 (18.7) | 18,473 (21.0) | |
| 60–69 | 6806 (18.7) | 12,863 (14.6) | |
| 70–79 | 4534 (12.5) | 5892 (6.7) | |
| ≥ 80 | 3352 (9.2) | 3570 (4.1) | |
| Sex, male | 36,228 (41.2) | 12,498 (34.4) | < 0.001 |
| Residence | < 0.001 | ||
| Seoul | 2367 ( 6.5) | 5689 ( 6.5) | |
| Gyeonggi-do | 23,442 (64.5) | 58,051 (66.0) | |
| Daegu | 2088 ( 5.7) | 4767 ( 5.4) | |
| Gyeongsangbuk-do | 4716 (13.0) | 10,391 (11.8) | |
| Other area | 3752 (10.3) | 9067 (10.3) | |
| Underlying disability | 3109 (8.5) | 4546 (5.2) | < 0.001 |
| Income level | < 0.001 | ||
| Q1 (Lowest) | 9758 (26.8) | 22,629 (25.7) | |
| Q2 | 6681 (18.4) | 18,298 (20.8) | |
| Q3 | 7815 (21.5) | 19,959 (22.7) | |
| Q4 (Highest) | 11,492 (31.6) | 25,577 (29.1) | |
| Unknown | 619 (1.7) | 1502 ( 1.7) | |
| Charlson comorbidity index | 2.7 (3.3) | 1.5 (2.6) | < 0.001 |
| Hypertension | 12,896 (35.5) | 19,831 (22.5) | < 0.001 |
| DM without chronic complication | 5676 (15.6) | 8105 ( 9.2) | < 0.001 |
| DM with chronic complication | 1897 ( 5.2) | 2358 ( 2.7) | < 0.001 |
| Peripheral vascular disease | 3306 ( 9.1) | 3892 ( 4.4) | < 0.001 |
| Renal disease | 663 ( 1.8) | 729 ( 0.8) | < 0.001 |
| Rheumatic disease | 1325 ( 3.6) | 1633 ( 1.9) | < 0.001 |
| Dementia | 1940 ( 5.3) | 1986 ( 2.3) | < 0.001 |
| Peptic ulcer disease | 4397 (12.1) | 5475 ( 6.2) | < 0.001 |
| Hemiplegia or paraplegia | 255 ( 0.7) | 313 ( 0.4) | < 0.001 |
| Moderate or severe liver disease | 58 ( 0.2) | 88 ( 0.1) | 0.007 |
| Mild liver disease | 5546 (15.3) | 8066 ( 9.2) | < 0.001 |
| Cerebrovascular disease | 2635 ( 7.2) | 3128 ( 3.6) | < 0.001 |
| Congestive heart failure | 1905 ( 5.2) | 1778 ( 2.0) | < 0.001 |
| Myocardial infarction | 554 ( 1.5) | 633 ( 0.7) | < 0.001 |
| Malignancy | 8859 (24.4) | 13,154 (15.0) | < 0.001 |
| Metastatic solid tumor | 1886 ( 5.2) | 2186 ( 2.5) | < 0.001 |
| AIDS/HIV | 12 ( 0.0) | 20 ( 0.0) | 0.405 |
Presented as mean with standard deviation or number with percentage
CRD, chronic respiratory disease; SD, standard deviation; DM, diabetes mellitus; AIDS, acquired immune deficiency syndrome; HIV, Human Immunodeficiency Virus