Table 1.

Baseline characteristics of the study population

Variable	Number	%
Age (years)
<55	607	24
55–65	727	29
65–75	708	28
75+	499	19
Smoking status
Current smoker	1169	46
Ex-smoker	487	19
Never smoked	839	33
Unknown	46	2
Racial group
White	1782	71
South Asian	688	27
Other	45	2
Unknown	26	1
Diabetes
Yes	567	22
No	1957	77
Unknown	17	1