Table 1.

Characteristics of study populations in bladder cancer studies included in the analyses

CasesControls
Smoking statusSmoking status
NeverN%NeverN%
Age at diagnosisMaleFemaleFormerN%Age at selectionMaleFemaleFormerN%
StudyNmeanrangeN (%)N (%)CurrentN%NmeanrangeN (%)N (%)CurrentN%
SBCS1,10665.92281970 (88%)136 (12%)15214%1,05064.62081925 (88%)125 (12%)30331%
42841%38940%
47145%27028%
PLCO70867.23586570 (81%)138 (19%)17124%1,87373.855881524 (81%)349 (19%)48826%
42560%81844%
11216%56730%
CPS II55870.45487446 (80%)112 (20%)13525%72969.45289499 (68%)230 (32%)32946%
33862%34849%
7414%325%
(NEBCS-ME, VT)63064.93279495 (79%)135 (21%)9816%75963.93079578 (76%)181 (24%)24934%
31852%37351%
19732%11415%
ATBC40169.85288401 (100%)0 (0%)00%70769.66082707 (100%)0 (0%)00%
00%00%
401100%707100%
NEBCS-NH36765.03179274 (75%)93 (25%)5816%38565.33079277 (72%)108 (28%)13837%
18953%18549%
11331%5414%
HPFS11068.44886110 (100%)0 (0%)3532%11668.34984116 (100%)0 (0%)3732%
5248%6354%
2220%1614%
NHS6260.537790 (0%)62 (100%)1931%6160.137780 (0%)61 (100%)2134%
1423%2033%
2947%2033%
All studies combined3,94266.922883,266 (83%)676 (17%)66817%5,68066.320894,626 (81%)1,054 (19%)1,56528%
1,76446%2,19640%
1,41937%1,78032%

NOTE: Differences in the total number of cases and controls and frequencies by smoking status is due to subjects classified as occasional smokers or with missing smoking information. Smoker controls were oversampled in PLCO, HPFS, and NHS.