Table 1.
Characteristics of study participants at recruitment and at the 3‐year survey, by smoking status reported at recruitment
| Never smoked | Ever smoked | |
|---|---|---|
| Characteristics reported at recruitment | n = 634,039 | n = 607,726 |
| Age (years) | 56.3 (4.9) | 55.9 (4.8) |
| Ever used oral contraceptives | 56% (350,335) | 64% (384,504) |
| Most deprived third of population | 28% (172,827) | 39% (236,759) |
| No educational qualifications | 38% (233,208) | 49% (290,512) |
| Asthma requiring treatment | 7% (44,009) | 9% (52,744) |
| Body mass index > 30 kg/m2 | 18% (106,072) | 18% (103,808) |
| Strenuous exercise more than once a week | 22% (133,334) | 20% (117,692) |
| Menopause (natural or bilateral oophorectomy) at age <45 years | 9% (19,778) | 15% (27,358) |
| Postmenopausala | 72% (454,399) | 71% (428,751) |
| Ever used HRT (in postmenopausal1 women) | 47% (211,035) | 52% (219,153) |
| >7 alcoholic drinks/week | 14% (91,024) | 25% (150,310) |
| Follow‐up from recruitment | ||
| Person‐years (1000s) | 8,886 | 8,250 |
| Incident lung cancers | 1,469 | 15,642 |
| Characteristics reported at 3‐year survey | n = 422,009 | n = 354,238 |
| White ethnicity | 98.7% (410,734) | 99.4% (347,001) |
| In excellent/good health | 80% (322,845) | 72% (244,273) |
| Parent smoked at birth or age 10 of participant | 81% (319,154) | 88% (289,499) |
| Parent with lung cancer | 11% (46,353) | 12% (42,492) |
| Living with a partner | 82% (342,217) | 78% (271,049) |
| Partner smokes (in women living with a partner) | 13% (42,940) | 23% (61,591) |
| 14+ pieces of fruit/week | 39% (157,203) | 32% (107,746) |
| 4+ heaped tablespoons of vegetables/day | 24% (97,551) | 23% (78,153) |
| Follow‐up from 3‐year survey | ||
| Person‐years (1000s) | 6,090 | 5,015 |
| Incident lung cancers | 890 | 7,255 |
For all characteristics, entries are mean (and SD) or % (and numerator). Numbers do not always sum to totals due to missing values.
a
Natural menopause, bilateral oophorectomy or aged ≥55 years at recruitment.