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   ocr: Dukes" StageA or. B Positive Sample Size Cancers Predictive Case Control Study Control Value nvestigation Study Design Group Group Group Group Sensilivily Specificity (%) Winawer et al, 1980'23 Controlled trial 13,127 8,834 59 (66%) 12 (3350) 24 NA 44-50 Mandel et al, 1993121 RCT 31,157 15,394 722 (61%) 394 (58%) 81-92 90-98 2.2-5.6 Thomas and Hardcastle RCT 71,277 71,413 121 (76%) 261 (46%) 80 99 10.5-8.6 1991,115 Hardcastle etal, 1989114 Kewenter et al, 1991," 115 RCT 25,655 25,670 64 (64%) 34 (35%) 22 93 8.2 1988116 Krongborg et al, RCT 30,970 30,968 50 (80%) 115 (42%) 48 99 13.4 1989,117 K ...