Table 1.
Characteristics of the study population at the beginning of follow-up
| Total (N = 3,858,422) | Bronchiectasis |
||
|---|---|---|---|
| No (n = 3,793,117) | Yes (n = 65,305) | ||
| Age, years | |||
| <60 | 3,053,882 (79.2) | 3,019,622 (79.6) | 34,260 (52.5) |
| ⩾60 | 804,540 (20.8) | 773,495 (20.4) | 31,045 (47.5) |
| Female | 1,762,757 (45.7) | 1,729,292 (45.6) | 33,465 (51.2) |
| BMI, kg/m2 | 23.7 ± 3.2 | 23.7 ± 3.2 | 23.6 ± 3.2 |
| BMI groups | |||
| <18.5 | 143,365 (3.7) | 140,377 (3.7) | 2,988 (4.6) |
| 18.5–22.9 | 1,507,926 (39.1) | 1,482,814 (39.1) | 25,112 (38.5) |
| 23.0–24.9 | 948,851 (24.6) | 932,559 (24.6) | 16,292 (24.9) |
| ⩾25.0 | 1,258,280 (32.6) | 1,237,367 (32.6) | 20,913 (32.0) |
| Smoking | |||
| Never smoker | 2,323,605 (60.2) | 2,279,598 (60.1) | 44,007 (67.4) |
| Ever smoker | |||
| <10 pack-years | 587,911 (15.2) | 582,471 (15.4) | 5,440 (8.3) |
| 10–19 pack-years | 445,733 (11.6) | 440,473 (11.6) | 5,260 (8.1) |
| ⩾20 pack-years | 501,173 (13.0) | 490,575 (12.9) | 10,598 (16.2) |
| Alcohol consumption | |||
| None | 1,988,595 (51.5) | 1,945,963 (51.3) | 42,632 (65.3) |
| Mild | 1,561,788 (40.5) | 1,542,994 (40.7) | 18,794 (28.8) |
| Heavy | 308,039 (8.0) | 304,160 (8.0) | 3,879 (5.9) |
| Income | |||
| Low | 597,754 (15.5) | 587,702 (15.5) | 10,052 (15.4) |
| High | 3,260,668 (84.5) | 3,205,415 (84.5) | 55,253 (84.6) |
| Physical activity | |||
| Regular | 687,583 (17.8) | 675,259 (17.8) | 12,324 (18.9) |
| Non-regular | 3170,839 (82.2) | 3,117,858 (82.2) | 52,981 (81.1) |
| Number of Chest CT scans | 0.03 ± 0.22 | 0.03 ± 0.20 | 0.33 ± 0.72 |
| Comorbidities | |||
| COPD | 191,662 (5.0) | 170,179 (4.5) | 21,483 (32.9) |
| CCI | |||
| 0 | 2,498,686 (64.8) | 2, 474,818 (65.2) | 23,868 (36.6) |
| 1 | 779,991 (20.2) | 760,512 (20.1) | 19,479 (29.8) |
| ⩾2 | 579,745 (15.0) | 557,787 (14.7) | 21,958 (33.6) |
Definition of abbreviations: BMI = body mass index; CCI = Charlson Comorbidity Index; COPD = chronic obstructive pulmonary disease; CT = computed tomography.
Data are represented as a number (percentage) or mean ± standard deviation.