Table 1.

Patient characteristics, N = 8996

Characteristic	n (%)
Sex
Male	4441 (49.4)
Female	4555 (50.6)

Smoking status^a
Smoker status not recorded	60 (0.7)
Smoker/ex-smoker	5951 (66.2)
Never smoked	2985 (33.2)

Age group, years
50–55	1485 (16.5)
56–60	1484 (16.5)
61–65	1777 (19.8)
66–70	1598 (17.8)
71–75	1205 (13.4)
76–80	845 (9.4)
>80	602 (6.7)

Symptoms recorded, n
1	3527 (39.2)
2	3240 (36.0)
3	1674 (18.6)
≥4	555 (6.2)

Thrombocytosis
Thrombocytosis in 24 months prior to SR-CXR^b	395 (7.2)

Index of Multiple Deprivation score, decile
1 (greatest deprivation)	2844 (31.6)
2	2233 (24.8)
3	1350 (15.0)
4	1652 (18.4)
5	753 (8.4)
6	29 (0.3)
7	38 (0.4)
8	37 (0.4)
9	35 (0.4)
10 (least deprivation)	25 (0.3)

↵a Category in which stated percentages do not total 100 due to rounding.
↵b Out of 5524 people, who had FBC. FBC = full blood count (the blood test routinely used to detect thrombocytosis). SR-CXR = self-requested chest X-ray.