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Table 3 Number of food items and portion size reported by each study within 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 Food items (n) Portion size
Case–control studies
 Los-Angeles bladder cancer Case–control study [10] 49 Yes
 Roswell Park Cancer Institute [11] 44 Yes
 Belgian Case–control study on bladder cancer [12] 788 Yes
 Aichi Prefecture Case–control study [13] 107 Yes
 Kaohsiung [14] 41 Yes
 Hessen Case–control study on bladder cancer [15] 26 No
 Stockholm Case–control study [16] 188 Yes
 Roswell Park Memorial Institute Case–control study on bladder cancer [17] 64 Yes
 Reina Sofia University [18] 17 No
 New Hampshire bladder cancer study [19] 121 Yes
 Italian Case–control study on bladder cancer [20] 21 No
 Brescia bladder cancer study [21] 40 Yes
 Dortmund Hörde study [22] 3 Yes
 National Enhanced Cancer Surveillance System (NESCC) [23] 69 Yes
 French INSERM study [24] 2 No
 South and East China Case–control study on bladder and prostate cancer [25] 52 No
 Molecular Epidemiology of Bladder Cancer and Prostate Cancer [26] 90 Yes
 North Carolina case control study [27] 9 No
Cohort studies
 Swedish Mammography Cohort (SMC) & the Cohort of Swedish Men [28] 96 No
 Netherlands Cohort Study on diet and cancer, the Netherlands, 1986–2003 [29] 150 Yes
 Women’s Lifestyle and Health Study [30] 98 Yes
 RERF atomic bomb survivors Study [31] 102 No
 Vital study [32] 126 Yes
 European Prospective Investigation into Cancer and Nutrition (EPIC) [33, 34] 260a Yes
  1. aDietary intake was assessed by a number of different instruments in the participating countries and the number of different food items varied from 88 (Norway) to 2443 (Sweden)