Table 1.
Validation of semi-automated surveillance
| Validation sample 1 (n = 700) Random sample of patients from study population |
Validation sample 2 (n = 637) Patients from study population having HAP according to ICD-10 discharge diagnostic codes |
Validation sample 3 (n = 754) Patients from population of four departments of the year 2016, comprising all 165 patients with and a random sample of 589 patients without HAP according to ICD-10 discharge diagnostic codes |
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|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cross tabulation of full manual surveillance x semi-automated surveillance | Full manual surveillance | Full manual surveillance | Full manual surveillance | |||||||||
| nvHAP | No nvHAP | nvHAP | No nvHAP | nvHAP | No nvHAP | |||||||
| Semi-automated surveillance | nvHAP | 4 | 0 | Semi-automated surveillance | nvHAP | 155 | 0 | Semi-automated surveillance | nvHAP | 35 | 0 | |
| No nvHAP | 0 | 696 | No nvHAP | 4 | 478 | No nvHAP | 0 | 719 | ||||
| Sensitivity | 100% (CI: 39.8–100%) | 97.5% (CI: 93.7–99.3%) | 100% (CI: 90.0–100%) | |||||||||
| Negative predictive value | 100% (CI: 99.5–100%) | 99.2% (CI: 97.9–99.8%) | 100% (CI: 99.5–100%) | |||||||||
| Accuracy | 100% (CI: 99.5–100%) | 99.4% (CI: 98.4–99.8%) | 100% (CI: 99.5–100%) | |||||||||
CI, 95% confidence interval; nvHAP, non-ventilator-associated hospital-acquired pneumonia.
Validation of ‘semi-automated surveillance’ (i.e. applying classification algorithm—to reduce number of patients needed to screen, i.e. ‘at-risk’ patients—followed by manual surveillance of ‘at-risk’ patients) by ‘full manual surveillance’ (i.e. manual surveillance of all patients) was performed on three ‘validation samples’. Fourfold tables and sensitivity, negative predictive value, and accuracy are presented for each validation sample separately.