Table 3.
Organisms defined as community-acquired, comparing old and new ICUs, in descending order of isolate count from the old ICU
| Organism | Old ICU* |
New ICU† |
IRR (95% CI) ¶ | P** | ||
|---|---|---|---|---|---|---|
| Isolate count | IR‡ | Isolate count | IR§ | |||
| Staphylococcus aureus | 155 | 10.5 | 196 | 11.3 | 1.08 (0.87–1.34) | 0.49 |
| Non-MRSA | 133 | 9.03 | 178 | 10.3 | 1.07 (0.96–1.19) | 0.25 |
| MRSA | 22 | 1.49 | 18 | 1.04 | 0.70 (0.35–1.40) | 0.26 |
| Coagulase-negative staphylococci | 101 | 6.85 | 81 | 4.68 | 0.68 (0.50–0.92) | 0.01 |
| Enterococcus species | 74 | 5.02 | 119 | 6.88 | 1.37 (1.01–1.85) | 0.03 |
| Non-VRE | 35 | 2.38 | 28 | 1.62 | 0.68 (0.40–1.15) | 0.13 |
| VRE (including surveillance) | 39 | 2.65 | 91 | 5.26 | 1.99 (1.35–2.97) | < 0.01 |
| VRE (excluding surveillance) | 3 | 0.20 | 7 | 0.40 | 1.99 (0.45–11.9) | 0.33 |
| Pseudomonas aeruginosa | 21 | 1.43 | 20 | 1.16 | 0.81 (0.42–1.57) | 0.51 |
| Streptococcus pneumoniae | 19 | 1.29 | 35 | 2.02 | 1.57 (0.87–2.90) | 0.11 |
| Other drug-resistant organisms | ||||||
| ESBL-producing organisms | 6 | 0.41 | 12 | 0.69 | 1.70 (0.59–5.53) | 0.29 |
| CPE | 1 | 0.07 | 3 | 0.17 | 0.85 (0.11–6.36) | 0.85 |
CPE = carbapenemase-producing Enterobacterales. ESBL = extended spectrum beta-lactamase. ICU = intensive care unit. IR = incidence rate. IRR = incidence rate ratio. MRSA = methicillin-resistant S. aureus. OBD = occupied bed-days. VRE = vancomycin-resistant enterococci.
24-bed ICU used during the period 5 May 2014 to 4 May 2016.
32-bed ICU used during the period 5 May 2016 to 4 May 2018.
Incidence per 1000 OBD across 14734 OBD in the 2 years from 5 May 2014 to 4 May 2016.
Incidence per 1000 OBD across 17305 OBD in the 2 years from 5 May 2016 to 4 May 2018.
IRR of the new ICU compared with the old ICU.
Mid P values for tests of IR difference.