Table 3

Characteristics of the lung and prostate cancer case-control study participants

Lung cancerProstate cancer
Case (%)Control (%)Case (%)Control (%)
Gender
 Male254 (71)236 (66)235 (100)456 (100)
 Female102 (29)120 (34)
Race
 White333 (94)337 (95)215 (91)415 (91)
 Black13 (4)8 (2)11 (5)28 (6)
 Other/Unknown10 (3)11 (3)9 (4)13 (3)
Exposure populationa
 Asbestos95 (27)95 (27)94 (40)181 (40)
 Heavy smoker261 (73)261 (73)141 (60)275 (60)
Intervention arma
 Active196 (55)196 (55)111 (47)212 (46)
 Placebo160 (45)160 (45)124 (53)244 (54)
Age group (yr)a
 44–494 (1)4 (1)4 (2)7 (2)
 50–5452 (15)52 (15)41 (17)81 (18)
 55–5980 (22)80 (22)65 (28)129 (28)
 60–64122 (34)122 (34)61 (26)119 (26)
 65–6993 (26)93 (26)59 (25)111 (24)
 70–745 (1)5 (1)5 (2)9 (2)
Study center
 Baltimore24 (7)26 (7)25 (11)39 (9)
 Irvine34 (10)32 (9)30 (13)49 (11)
 New Haven20 (6)19 (5)24 (10)35 (8)
 Portland105 (29)94 (26)47 (20)118 (26)
 San Francisco13 (4)15 (4)12 (5)33 (7)
 Seattle160 (45)170 (48)97 (41)182 (40)
Baseline smoking statusa
 Current255 (72)255 (72)109 (46)213 (47)
 Former101 (28)101 (28)119 (51)232 (51)
 Never7 (3)11 (2)
Randomization yeara
 19856 (2)6 (2)7 (3)9 (2)
 198633 (9)33 (9)24 (10)42 (9)
 198737 (10)37 (10)12 (5)26 (6)
 19881 (<1)1 (<1)1 (<1)2 (<1)
 198942 (12)42 (12)16 (7)32 (7)
 199080 (22)80 (22)66 (28)128 (28)
 199175 (21)75 (21)47 (20)94 (21)
 199250 (14)50 (14)36 (15)72 (16)
 199327 (8)27 (8)18 (8)35 (8)
 19945 (1)5 (1)8 (3)16 (4)
Year of blood drawa
 Baseline203 (57)203 (57)139 (59)274 (60)
 Year 291 (26)91 (26)56 (24)111 (24)
 Year 36 (2)6 (2)6 (3)11 (2)
 Year 428 (8)28 (8)14 (6)26 (6)
 Year 58 (2)8 (2)5 (2)9 (2)
 Year 67 (2)7 (2)7 (3)12 (3)
 Year 77 (2)7 (2)5 (2)8 (2)
 Year 86 (2)6 (2)3 (1)5 (1)
  • a Matching variable.