Table 4.
Sensivity, specificity and agreement for diabetes mellitus and hypertension.
| TN | FN | FP | TP | Inter-observers agreement kappa (CI 95%) |
Sensitivity % (CI 95%) |
χ2 p-value |
Specificity % (CI 95%) |
χ2 p-value |
Diagnostic agreement kappa (CI 95%) |
|
|---|---|---|---|---|---|---|---|---|---|---|
| Diabetes | 390 | 2 | 2 | 421 | 0.988 (0.977 - 0.998) | 99.53 (98.29 - 99.87) | 99.49 (98.16 - 99.86) | 0.990 (0.981 - 1) | ||
| - Male | 188 | 1 | 1 | 207 | 0.985 (0.968 - 1) | 99.52 (97.33 - 99.92) | 1* | 99.52 (97.34 - 99.92) | 1* | 0.990 (0.976 - 1) |
| - Female | 202 | 1 | 1 | 214 | 0.990 (0.977 - 1) | 99.54 (97.41 - 99.92) | 99.53 (97.40 - 99.92) | 0.990 (0.977 - 1) | ||
| - Age < 70 | 198 | 1 | 1 | 207 | 0.980 (0.961 - 1) | 99.52 (97.33 - 99.92) | 1* | 99.50 (97.21 - 99.91) | 1* | 0.990 (0.977 - 1) |
| - Age ≥ 70 | 192 | 1 | 1 | 214 | 0.995 (0.985 - 1) | 99.54 (97.41 - 99.92) | 99.48 (97.12 - 99.91) | 0.990 (0.977 - 1) | ||
| Hypertension | 254 | 72 | 8 | 415 | 0.941 (0.916 - 0.967) | 85.22 (81.79 - 88.09) | 96.95 (94.09 - 98.45) | 0.778 (0.732 - 0.823) | ||
| - Male | 32 | 32 | 3 | 172 | 0.937 (0.897 - 0.978) | 96.95 (94.09 - 98.45) | 0.634 | 97.30 (92.35 - 99.08) | 1* | 0.770 (0.700 - 0.841) |
| - Female | 40 | 40 | 5 | 243 | 0.944 (0.911 - 0.977) | 85.87 (81.33 - 89.45) | 96.69 (92.48 - 98.58) | 0.783 (0.724 - 0.842) | ||
| - Age < 70 | 119 | 18 | 5 | 173 | 0.96 (0.928 - 0.992) | 90.58 (85.6 - 93.96) | 0.007 | 95.97 (90.91 - 98.27) | 0.482* | 0.850 (0.791 - 0.909) |
| - Age ≥ 70 | 135 | 54 | 3 | 242 | 0.926 (0.888 - 0.964) | 81.76 (76.96 - 85.74) | 97.83 (93.80 - 99.26) | 0.724 (0.660 - 0.789) | ||
| - Without DM | 232 | 46 | 7 | 312 | 0.947 (0.921 - 0.974) | 87.15 (83.29 - 90.23) | 0.045 | 97.07 (94.08 - 98.57) | 0.526* | 0.947 (0.921 - 0.974) |
| - With DM | 22 | 26 | 1 | 103 | 0.882 (0.781 - 0.983) | 79.85 (72.11 - 85.86) | 95.65 (79.01 - 99.23) | 0.522 (0.376 - 0.668) | ||
* Fisher's exact bilateral test; TP: true positive; FP: false positive; TN: true negative; FN: false negative; CI 95%: confidence interval at 95%; DM: diabetes mellitus.