Selected characteristics of the study participants (n=228 614), overall and by sex, in the UK Biobank study, 2006–2010, UK
| Women | Men | Total | ||||
|---|---|---|---|---|---|---|
| Characteristics | n | Per cent | n | Per cent | N | Per cent |
| Total, n (%) | 118 518 | 51.8 | 110 096 | 48.2 | 228 614 | 100 |
| Age category (years), n (%) | ||||||
| 35–39 | 0 | 0.0 | 2 | 0.0 | 2 | 0.0 |
| 40–44 | 18 708 | 15.8 | 17 667 | 16.1 | 36 375 | 15.9 |
| 45–49 | 25 374 | 21.4 | 21 255 | 19.3 | 46 629 | 20.4 |
| 50–54 | 28 561 | 24.1 | 22 813 | 20.7 | 51 374 | 22.5 |
| 55–59 | 27 099 | 22.9 | 23 135 | 21.0 | 50 234 | 22.0 |
| 60–64 | 15 104 | 12.7 | 19 890 | 18.1 | 34 994 | 15.3 |
| 65–69 | 3618 | 3.1 | 5237 | 4.8 | 8855 | 3.9 |
| 70–74 | 54 | 0.1 | 97 | 0.1 | 151 | 0.1 |
| Age (years) | ||||||
| Mean (SD) | 52.22 | (6.76) | 52.99 | (7.32) | 52.59 | (7.04) |
| Smoking status, n (%) | ||||||
| Never | 72 053 | 60.8 | 57 805 | 52.5 | 129 858 | 56.8 |
| Former (quit >6 months ago) | 34 838 | 29.4 | 39 647 | 36.0 | 74 485 | 32.6 |
| Current | 9633 | 8.1 | 11 335 | 10.3 | 20 968 | 9.2 |
| Unknown | 1994 | 1.7 | 1309 | 1.2 | 3303 | 1.4 |
| Smoking pack-years* | ||||||
| Mean (SD) | 17.86 | (13.25) | 22.97 | (17.68) | 20.54 | (15.94) |
| Time since quitting smoking (years)† | ||||||
| Mean (SD) | 16.59 | (10.85) | 17.28 | (11.29) | 16.96 | (11.09) |
| Doctor's diagnosis of asthma, n (%) | ||||||
| Never | 104 444 | 88.1 | 98 642 | 89.6 | 203 086 | 88.8 |
| Ever | 14 074 | 11.9 | 11 454 | 10.4 | 25 528 | 11.2 |
*Smoking pack-years=(n cigarettes/day÷20 cigarettes/pack)×n years; among ever smokers.
†Time since quitting smoking=years since last smoked cigarette to time of interview; among former smokers.