Pap smear Cervicogram Pap smear + Cervicogram Total Normal Pap smear Cervicogram Abnormal Pap smear Cervicogram NS, not significant. Negative Positive Negative Positive Negative Positive Negative Positive Total Negative Positive Total Cervicogram as a Primary Screening Test Table 3. Correlation between Screening Tests and Histological Findings Histology Negative 84 46 103 27 67 63 130 67 17 84 36 10 46 79.3% 51.5% 67.4% 66.3% 32.6% 33.7% Table 4. Correlation between Cervicogram and Histological Findings Histology Negative Positive Positive 46 118 99 65 34 130 164 34 12 46 65 53 118 26.1% 79.8% 41.4% 66.3% 58.6% 33.7% Total 130 164 202 92 101 193 294 p NS NS 44.9% 78.3% 84.1% 32.7% 15.9% 67.3% Pap smear Cervicogram Pap smear+Cervicogram Cervicogram Negative Pap smear Positive Pap smear Table 5. Diagnostic Accuracy of Screening Methods Sensitivity Specificity PPV NPV FPR FNR 72.0% 64.6% 72.0% 64.6% 28.0% 35.4% 39.6% 79.2% 70.7% 31.0% 29.3% 49.0% PPV, positive predictive value; NPV, negative predictive value; FPR, false positive rate; FNR, false negative rate. 67.4%, the negative predictive value was 66.3%, the false positive rate was 32.6%, and the false negative rate was 33.7%. The instances of a positive result on both screening tests, but with a negative result on histology were 63 cases (21.4%). 34 cases (11.6%) were negative on both tests and positive on histology (Table 3, 5). Yonsei Med J Vol. 46, No. 2, 2005