Table 5 2 by 2 table for the FOBT only, model only and a combined approach of FOBT positive plus risk positive at PPV 3% level (probability: 0.0168) for those with negative results
|  | Diagnostic Positive: Record/diagnosis of CRC (over 2 year follow up) | Diagnostic Negative: No record/diagnosis of CRC (over 2 year follow up) | |||
|---|---|---|---|---|---|
CRC | Polyp | Total | Total | ||
Index Test Positive | FOBT only n = 25,592 | 158 | 291 | 449 | 846 |
Model Only (negative population only, n = 24,297) | 13 | 28 | 41 | 1288 | |
Combined n = 25,592 (positive result is either risk positive or FOBT positive) | 171 | 319 | 490 | 2134 | |
Index Test Negative | FOBT only n = 25,592 | 165 | 219 | 384 | 23,913 |
Model Only (negative population only, n = 24,297) | 152 | 191 | 343 | 22,625 | |
Combined n = 25,592 (positive result is either risk positive or FOBT positive) | 152 | 191 | 343 | 22,625 | |