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f guaiac and immunochemical tests for the detection of CRC was 2.26 (95% CI =0.83-6.18) and 7.59 (95% CI =3.86-14.94), whereas the negative likelihood ratio was 0.64 (95% CI =0.24-1.71) and 0.28 (95% CI =0.05-1.52), respectively. The positive predictive values of guaiac and immunochemical tests were 3.45% (95% CI =0.426-11.91) and 10.71% (95% CI =2.27-28.23), respectively. There was no marked difference in the negative predictive values for both methods. The sensitivity of the fecal occult blood test by FIT was significantly higher for