Table 1
Characteristics of patients surveyed in the University Medical Centre Ljubljana, during the Slovenian national healthcare-associated infections survey (SNHPS) in 2011, eligible for the retrospective medical chart review (RMCR), and of those included into the RMCR.
| SNHPS population eligible for RMCR | RMCR population | ||
|---|---|---|---|
| The number of patients | 1655 | 1474 | |
| Sex | |||
| Women | 809 (48.9%) | 738 (50.1%) | |
| Men | 846 (51.1%) | 736 (49.9%) | |
| Age (at the time of admission) | |||
| Median | 60 | 60 | |
| Range | 0-98 | 0-98 | |
| Mean | 55 | 55 | |
| ≤49 years | 589 (35.6%) | 508 (34.5%) | |
| 50-79 years | 807 (48.8%) | 715 (48.5%) | |
| ≥80 years | 259 (15.6%) | 251 (17.0%) | |
| McCabe index (at the time of admission) | |||
| nonfatal disease | 1298 (78.4%) | 1183 (80.3%) | |
| ultimately fatal disease | 280 (16.9%) | 239 (16.2%) | |
| rapidly fatal disease | 66 (4.0)% | 52 (3.5%) | |
| unknown | 11 (0.7%) | 0 (0.00%) | |
| The length of hospital stay (until SNHPS day) | |||
| Median | 6 | 6 | |
| Range | 0 - 367 | 0 - 323 | |
| Mean | 13 | 12 | |
| 0-3 days | 594 (35.9%) | 533 (36.1%) | |
| 4-7 days | 396 (23.9%) | 369 (25.0%) | |
| 8-14 days | 267 (16.1%) | 230 (15.6%) | |
| ≥15 days | 398 (24.0%) | 342 (23.2%) | |
| Operations last month (until SNHPS day) | |||
| Surgery | 571 (34.5%) | 574 (38.9%) | |
| No surgery | 1084 (65.5%) | 900 (61.1%) | |
ain the case of implant, operations during 12 months, preceding the SNHPS
Table 2
Sensitivity, specificity, positive predictive value and negative predictive value of the method used for ascertaining any of the six types of healthcare-associated infections (HAIs) among 1474 patients enrolled at the University Medical Centre Ljubljana in the Slovenian national HAI prevalence survey in 2011, in comparison to the retrospective medical chart review.
| Retrospective medical chart review | ||||
|---|---|---|---|---|
| HAI | No HAI | Total | ||
| Slovenian national HAI prevalence survey | HAI | 63 | 16 | 79 |
| No HAI | 8 | 1387 | 1395 | |
| Total | 71 | 1403 | 1474 | |
Sensitivity: 63/71x100=88.7% (95% CI: 79.0%-95.0%) Specificity: 1387/1403x100=98.9% (95% CI: 98.2%-99.4%) Positive predictive value (PPV): 63/79x100=79.7% (95% CI: 64.9%-84.4%)
Negative predictive value (NPV): 1387/1395x100=99.4% (95% CI: 98.4%-99.5%)
Table 3
Sensitivity, specificity of the method used for ascertaining any of the six types of healthcare-associated infections (HAIs) among 1655 eligible patients enrolled at the University Medical Centre Ljubljana in the Slovenian national HAI prevalence survey in 2011, in comparison to the retrospective medical chart review estimated by extrapolation of the results of the retrospective medical chart review conducted among 1474 patients.
| Retrospective medical chart review | ||||
|---|---|---|---|---|
| HAI | No HAI | Total | ||
| Slovenian national HAI prevalence survey | HAI | 77a | 19 | 96 |
| No HAI | 9 | 1550b | 1559 | |
| Total | 86 | 1569 | 1655 | |
Sensitivity: 77/86x100=89.5% (95% CI: 81.1%-95.1%)
Specificity: 1550/1569x100=98.8% (95% CI: 98.1%-99.2%)
Table 4
Sensitivity and specificity of the method used for ascertaining six different types of healthcare-associated infections (HAIs) among 1474 patients enrolled at the University Medical Centre Ljubljana in the Slovenian national HAI prevalence survey in 2011, in comparison to the retrospective medical chart review and respective kappa coefficients by type of HAIs.
| Surveillance method | SSI | UTI | PN | LRI | BSI | CRI |
|---|---|---|---|---|---|---|
| RMCR (reference) | ||||||
| Number of HAIs | 15 | 21 | 19 | 8 | 12 | 0 |
| Prevalence of HAI episodes* (%) 95% CI | 1.0 (0.6-1.7) | 1.4 (0.9-2.2) | 1.3 (0.8-2.0) | 0.5 (0.3-1.1) | 0.8 (0.5-1.4) | 0 (0.0-0.3) |
| SNHPS | ||||||
| Number of HAIs | 15 | 20 | 26 | 7 | 13 | 0 |
| Prevalence of HAI episodes* (%) 95% CI | 1.0 (0.6-1.7) | 1.4 (0.9-2.1) | 1.8 (1.2-2.6) | 0.5 (0.2-1.0) | 0.9 (0.5-1.5) | 0 (0.0-0.3) |
| Sensitivity (%) 95% CI | 86.7 (59.5-98.3) | 76.2 (52.8-91.8) | 89.5 (66.9-98.7) | 62.5 (24.5-91.5) | 91.7 (61.5-99.8) | / |
| Specificity (%) 95% CI | 99.9 (99.5-100) | 99.7 (99.3-99.9) | 99.4 (98.8-99.7) | 99.9 (99.5-100) | 99.9 (99.4-100) | 100 (99.8-100) |
| Kappa coefficient 95% CI | 0.87 (0.74-1.00) | 0.78 (0.64-0.92) | 0.75 (0.61-0.89) | 0.67 (0.39-0.94) | 0.88 (0.74-1.00) | / |
SSI: surgical site infections. UTI: urinary tract infections. PN: pneumoniae. LRI: lower respiratory tract infections, excluding pneumoniae. BSI: bloodstream infections (including microbiologically proven catheter related infections). CRI: catheter-related infections without bloodstream infections. 95% CI: 95% confidence interval