Table 1.
Participant characteristics recorded at Exam 2 according to later development of airflow obstruction.
| Non-airflow obstruction | Airflow obstruction | |||
|---|---|---|---|---|
| Men | Women | Men | Women | |
| N | 1504 | 1640 | 332 | 330 |
| Age (years), mean SD | 45.1 (10.3)* | 44.3 (9.9)* | 47.5 (9.7) | 46.3 (9.4) |
| BMI (kg/m2), mean SD | 26.7 (3.7)* | 24.7 (5.0)* | 26.2 (3.7) | 23.6 (3.7) |
| Height (m), mean SD | 1.7 (0.1) | 1.6 (0.1) | 1.7 (0.1) | 1.6 (0.1) |
| Pack years† | 18.3 (22.0)* | 10.1 (15.0) | 31.7 (27.9) | 22.5 (20.2) |
| Smoking – number of smokers (%) | 1330 (88.4)* | 1332 (81.2)* | 322 (97.0) | 316 (95.8) |
| BMI categories (kg/m2) n (%) | ||||
| <18.5 (underweight) | 7 (0.5) | 37 (2.3) | 2 (0.6) | 12 (3.6) |
| 18.5–25 (normal) | 507 (33.7) | 1020 (62.2) | 126 (38.0) | 221 (67.0) |
| 25–30 (overweight) | 745 (49.5) | 367 (22.4) | 160 (48.2) | 76 (23.0) |
| 30–35 (obese) | 208 (13.8) | 123 (7.5) | 40 (12.1) | 19 (5.8) |
| >35 | 37 (2.5) | 93 (5.7) | 4 (1.2) | 2 (0.6) |
Participants are divided into groups determined by the development of airflow obstruction at later exam cycles (i.e. any timepoint after initial enrolment at exam 2).
Data shown for subjects attending exam 2 only (i.e., 3806 out of 4587).
SD: standard deviation, n: number of participants, BMI: body mass index, m: metres, kg: kilograms, n: number, %: percentage. *Denotes statistical difference between values for airflow obstruction and non-airflow obstruction groups.
†Pack year data available for 4144 participants in this analysis.