Table 1 Participants in the cohort at recruitment and follow-up to 31 st December 2007
Men N = 1548 | Women N = 1911 | |
|---|---|---|
Demographics at recruitment: | ||
Age at 1 Jan 1966 (yrs): Mean (SD) | 39.2 (15.6) | 43.1 (12.3) |
Age at 1st examination (yrs): Mean (SD) | 41.5 (15.6) | 45.6 (12.2) |
Time worked in cotton industry (yrs): 1 to 3 | 193 (13%) | 73 (4%) |
4 to 10 | 286 (19%) | 226 (12%) |
11 to 20 | 322 (21%) | 435 (23%) |
21 to 40 | 542 (35%) | 846 (44%) |
More than 40 | 205 (13%) | 331 (17%) |
Smoking status: Never smoked | 333 (22%) | 856 (45%) |
Light smoker (1–14 cigarettes per day) | 589 (38%) | 615 (32%) |
Medium smoker (15–24 cigarettes per day) | 445 (29%) | 337 (18%) |
Heavy smoker (25+ cigarettes per day) | 91 (6%) | 54 (3%) |
Former smoker | 90 (6%) | 49 (3%) |
Follow-up: | ||
Number of workers | 1548 | 1911 |
Embarked before age 90 | 44 | 44 |
Embarked after age 90 | 0 | 2 |
Censored at age 90 then died later | 40 | 101 |
Censored at age 90 and still alive | 6 | 39 |
Died before age 90 | 900 | 1118 |
Alive and younger than age 90 | 558 | 607 |