Table 1.
Baseline characteristics of the study participants
| Variables | Total | IPF without admission |
IPF with admission |
P value |
|---|---|---|---|---|
| Sex (male), n (%) | 34,609 (67.3) | 22,186 (66.5) | 12,423 (68.9) | < 0.001 |
| Age | ||||
| Median (Q1–Q3) | 72.0 (64.0–79.0) | 71.0 (62.0–78.0) | 74.0 (66.0–80.0) | < 0.001 |
| < 40 years | 908 (1.8) | 787 (2.4) | 121 (0.7) | < 0.001 |
| 40–49 years | 1,661 (3.2) | 1,369 (4.1) | 292 (1.6) | |
| 50–59 years | 5,371 (10.4) | 4,082 (12.2) | 1,289 (7.2) | |
| 60–69 years | 13,709 (26.7) | 9,213 (27.6) | 4,496 (24.9) | |
| ≥ 70 years | 29,762 (57.9) | 17,929 (53.7) | 11,833 (65.6) | |
| Conary artery disease | 5,343 (10.4) | 1,288 (3.9) | 4,055 (22.5) | < 0.001 |
| Heart failure | 6,687 (13.0) | 1,102 (3.3) | 5,585 (31.0) | < 0.001 |
| Cerebrovascular disease | 2,324 (4.5) | 371 (1.1) | 1,953 (10.8) | < 0.001 |
| Hypertension | 10,266 (20.0) | 2,365 (7.1) | 7,901 (43.8) | < 0.001 |
| Diabetes | 11,197 (21.8) | 2,668 (8.0) | 8,529 (47.3) | < 0.001 |
| Chronic kidney disease | 1,453 (2.8) | 386 (1.2) | 1,067 (5.9) | < 0.001 |
| Region of residence | ||||
| Urban | 13,269 (25.8) | 8,742 (26.2) | 4,527 (25.1) | 0.007 |
| Rural | 38,142 (74.2) | 24,638 (73.8) | 13,504 (74.9) | |
| Household income | ||||
| 1st quintile | 11,548 (22.5) | 7,368 (22.1) | 4,180 (23.2) | < 0.001 |
| 2nd quintile | 5,717 (11.1) | 3,853 (11.5) | 1,864 (10.3) | |
| 3rd quintile | 7,323 (14.2) | 4,742 (14.2) | 2,581 (14.3) | |
| 4th quintile | 9,829 (19.1) | 6,376 (19.1) | 3,453 (19.2) | |
| 5th quintile | 16,994 (33.1) | 11,041 (33.1) | 5,953 (33.0) |
Represented as n (%)