1991 cohort | Missing | 2006 cohort | Missing | |
---|---|---|---|---|
Characteristics | Total | n / N | Total | n / N |
n ( %) | 905 (100.0) | 0/905 | 1277 (100.0) | 0/1277 |
Sex, male, n ( %) | 430 (47.5) | 0/905 | 634 (49.6) | 0/1277 |
Age, mean ( SD ) | 40.3 (5.7) | 0/905 | 55.9 (5.7) | 0/1277 |
Living alone, n ( %) | ||||
Yes | 175 (19.5) | 260 (20.4) | ||
No | 724 (80.5) | 6/905 | 1017 (79.6) | 0/1277 |
Education, n ( %) | ||||
Low (≤10 years) | 249 (28.2) | 322 (25.5) | ||
Medium (>10 to ≤15 years) | 435 (49.3) | 613 (48.6) | ||
High (>15 years) | 199 (22.5) | 22/905 | 327 (25.9) | 15/1277 |
Income, 1000 euro, mean ( SD ) | 15.2 (5.0) | 8/905 | 33.0 (25.2) | 4/1277 |
Income, 1000 euro, n (%) | ||||
Low tertile | 316 (34.9) | 423 (33.2) | ||
Middle tertile | 310 (34.3) | 425 (33.4) | ||
High tertile | 279 (30.8) | 0/905 | 425 (33.4) | 4/1277 |
Respiratory symptoms, previous year, n ( %) | ||||
No symptoms | 721 (79.7) | 944 (77.8) | ||
Light symptoms | 150 (16.6) | 202 (16.7) | ||
Severe symptoms | 34 (3.8) | 0/905 | 67 (5.5) | 64/1277 |
Smoking status at baseline, n (%) | ||||
Never smoker | 326 (36.2) | 659 (52.5) | ||
Current smoker | 461 (51.2) | 392 (31.2) | ||
Former smoker | 113 (12.6) | 5/905 | 204 (16.3) | 22/1277 |
BMI, mean ( SD ) | 25.1 (4.3) | 0/905 | 27.1 (4.6) | 0/1277 |
FEV 1 /FVC, mean ( SD ) | 80.1 (6.2) | 0/905 | 77.7 (7.3) | 0/1277 |
FEV 1 % of predicted value, mean (SD)a | 98.2 (12.2) | 0/905 | 93.7 (15.5) | 0/1277 |
FEV 1 /FVC, n (%) | ||||
<70 | 52 (5.7) | 138 (10.8) | ||
≥70 to <75 | 95 (10.5) | 204 (16.0) | ||
≥75 | 758 (83.8) | 0/905 | 935 (73.2) | 0/1277 |
BMI = body mass index. FEV1/FVC = forced expiratory volume in 1 second/forced vital capacity. SD = standard deviation. aThe predicted value of FEV1 was calculated by taking the age, height, and reference values into account.