Table 4.
Accuracy of surveillance data and disagreement between longitudinal study and surveillance data
| No. of cases according to surveillance system | No. of cases detected according to the longitudinal study | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Non HAIs | HAIsϮ | Not VAP | VAPϯ | Not SSI | SSIф | Not BSI | BSI2 | Not UTI | UTI1 | |
| No | 295 | 34 | 360 | 4 | 366 | 15 | 367 | 15 | 368 | 5 |
| Yes | 62 | 54 | 27 | 13 | 9 | 14 | 10 | 12 | 21 | 10 |
| Sensitivity % (95% CI*) | 61.4 (56.8, 65.9) | 76.5 (72.3, 80.6) | 48.3 (43.4, 53.1) | 44.4 (39.6, 49.3) | 66.7 (62.1, 71.3) | |||||
| Specificity% (95% CI) | 82.6 (79.1, 86.1) | 93.1 (90.6, 95.5) | 97.6 (96.1, 99.1) | 97.4 (95.8, 98.9) | 94.6 (92.4, 96.8) | |||||
| PPV¶% (95% CI) | 46.5 (41.9, 51.2) | 32.5 (27.9, 37.1) | 60.9 (56.1, 65.6) | 54.5 (49.7, 59.4) | 32.3 (27.7, 36.8) | |||||
| NPVɠ% (95% CI) | 89.7 (86.8, 92.5) | 98.9 (97.9, 99.9) | 96.1 (94.2, 98.1) | 96.1 (94.2, 98.1) | 98.7 (97.5, 99.8) | |||||
| Kappaɰ (95% CI) | 0.4 (0.30, 0.48) | 0.42 (0.33, 0.51) | 0.51 (0.41, 0.60) | 0.46 (0.36, 0.55) | 0.41 (0.31, 0.05) | |||||
¶PPV: positive predictive value; ɠNPV: negative predictive value; ɰKappa: Cohen’s kappa; ϮHAIs: healthcare-associated infections; ϯVAP: possible ventilator-associated pneumonia; фSSI: surgical site infection; 2BSI: bloodstream infection; 1UTI: urinary tract infection; *CI: confidence intervals