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Table 1 Characteristics of the studies included in the pooled analysis of the Bladder cancer Epidemiology and Nutritional Determinants study (BLEND)

From: International pooled study on diet and bladder cancer: the bladder cancer, epidemiology and nutritional determinants (BLEND) study: design and baseline characteristics

Study Country Recruitment
period
Study design Cases
N
Controls
N
     men women total men women total
Case–control studies
 Los-Angeles bladder cancer Case–control study [10] USA 1987–1999 Population based case–control 1,307 353 1,660 1,237 349 1,586
 Roswell Park Cancer Institute [11] USA 1982–1998 Hospital-based case–control 164 53 217 501 163 664
 Belgian Case–control study on bladder cancer [12] Belgium 1999–2004 Population based case–control 172 28 200 228 156 384
 Aichi Prefecture Case–control study [13] Japan 1996–1999 Hospital-based case–control 245 58 303 244 59 303
 Kaohsiung [14] Taiwan 1996–1997 Hospital-based case–control 31 9 40 124 36 160
 Hessen Case–control study on bladder cancer [15] Germany 1989–1992 Hospital-based case–control 239 61 300 239 61 300
 Stockholm Case–control study [16] Sweden 1985–1987 Population based case–control 204 67 271 281 268 549
 Roswell Park Memorial Institute Case–control study on bladder cancer [17] USA 1957–1965 Hospital-based case–control 415 138 553 3,253 4,636 7,889
 Reina Sofia University Hospital [18] Spain 1997 Hospital-based case–control 74 11 85 89 41 130
 New Hampshire bladder cancer study [19] USA 1994–2001 Population based case–control 286 104 390 185 138 323
 Italian Case–control study on bladder cancer [20] Italy 1985–1993 Hospital-based case–control 617 110 727 766 298 1,064
 Brescia bladder cancer study [21] Italy 1997–2000 Hospital-based case–control 200 0 200 214 0 214
 Dortmund Hörde study [22] Germany 2009–2010 Hospital based case–control 145 48 193 177 56 233
 National Enhanced Cancer Surveillance System (NESCC) [23] Canada 1994–1997 Population based case–control 600 311 911 2,451 2,423 4,874
 French INSERM study [24] France 1984–1987 Hospital-based case–control 166 33 199 275 47 322
 South and East China Case–control study on bladder and prostate cancer [25] China 2005–2008 Hospital-based case–control 390 93 483 364 100 464
 Molecular Epidemiology of Bladder Cancer and Prostate Cancer [26] USA 1993–1997 Hospital-based case–control 149 45 194 243 58 301
 North Carolina case control study [27] USA 1987–1991 Hospital-based case–control 188 56 244 174 41 215
Cohort studies
 Swedish Mammography Cohort (SMC) & the Cohort of Swedish Men [28] Sweden 1987–1990 Population based cohort 538 119 657 2,188 484 2,672
 Netherlands Cohort Study on diet and cancer [29] The Netherlands 1986–2003 Population based cohort 779 161 940 2,273 2,419 4,692
 Women's Lifestyle and Health Study [30] Norway, Sweden 1991–2006 Population based cohort 0 49 49 0 48,942 48,942
 RERF atomic bomb survivors Study [31] Japan 1950–2000 Population based cohort 216 85 301 19,362 28,249 47,611
 VITamins and Lifestyle Study (VITAL) [32] USA 2000–2008 Population based cohort 338 106 444 36,454 39,983 76,437
 European Prospective Investigation into Cancer and Nutrition (EPIC) [33, 34] Europe 1993–2006 Population based cohort 1,227 525 1,752 141,872 333,279 475,151
TOTAL 8,657 2,604 11,313 213,227 462,305 675,480