Abstract P161 Table Summary of patient variables and associated risk of effusion

Variable	No of patients	No with effusion at diagnosis (%)	Relative risk	p Value
All patients	200	50 (25)
Gender
Male	124	28 (23)	0.9	NS
Female	76	22 (29)	1.2	NS
Age (years)
<60	28	7 (25)	1.0	NS
60–69	73	19 (27)	1.0	NS
70–79	64	15 (22)	0.9	NS
>79	35	9 (26)	1.0	NS
Histology
Small cell	25	11 (44)	1.8	0.026
Non-small cell	140	31 (22)	0.9	NS
Undifferentiated	54	11 (20)	0.8	NS
Squamous	45	7 (16)	0.6	NS
Adenocarcinoma	38	13 (34)	1.4	NS
Bronchoalveolar	2	0 (0)	0	NS
Carcinoid	1	0 (0)	0	NS
No histology	35	8 (23)	0.9	NS
Side of primary
Left	83	20 (24)	1.0	NS
Right	111	28 (25)	1.0	NS
Lobe
Upper	115	25 (22)	0.8	NS
Middle	5	0 (0)	–	NS
Lower	49	16 (33)	1.3	NS