Table 2.
Patient characteristics of the training population.
| Patient categories | ||||
|---|---|---|---|---|
| All | No growth | ASB | CAUTI | |
| Per patient stay | ||||
| Demographics | ||||
| N | 1519 | 904 | 173 | 95 |
| Age, mean | 56.1 | 55.2 | 57.5 | 56.9 |
| Female sex | 52.9% | 45.8% | 57.2% | 76.8% |
| Hospital stay | ||||
| Cost, mean | $45,531 | $46,394 | $70,886 | $49,279 |
| Expected LOS (days) | 12.0 | 12.0 | 15.3 | 12.3 |
| LOS, mean (days) | 15.3 | 13.7 | 28.0 | 20.5 |
| LOS excess (days) | 3.3 | 1.6 | 12.7 | 8.1 |
| Case-mix index, mean | 4.3 | 4.6 | 4.8 | 4.6 |
| Number discharge diagnoses, mean | 18 | 17 | 23 | 19 |
| Urinary catheter | ||||
| No of catheters/stay, mean | 1.2 | 1.1 | 1.4 | 1.5 |
| UCx/stay, mean | 1.62 | 1.40 | 2.55 | 2.79 |
| +UCx /stay, mean | 0.46 | 0.00 | 1.60 | 1.66 |
| Any NHSNsymptomduring stay | 10.5% | 5.6% | 6.9% | 45.3% |
| Per urine culture | ||||
| Number of UCx | 2460 | 1620 | 182 | 97 |
| Urinary catheter | ||||
| Dwell time before UCx, mean (days) | 6.1 | 5.4 | 9.0 | 6.8 |
| Positive urinalysis | 59.2% | 51.0% | 88.5% | 83.5% |
| Signs (+/-48h of UCx) | ||||
| Fever unexplained by BCx | 33.3% | 39.3% | 0.0% | 63.9% |
| +BCx | 10.7% | 9.9% | 12.6% | 8.2% |
| Hypothermia | 36.8% | 35.1% | 48.9% | 27.8% |
| WBC, mean (x1000) | 12.5 | 12.7 | 13.0 | 12.2 |
| Low WBC | 10.0% | 10.5% | 7.1% | 7.2% |
| High WBC | 51.7% | 53.6% | 48.9% | 46.4% |
| Symptoms (+/-48h of UCx) | ||||
| From notes (NLP) | 4.1% | 2.0% | 0.0% | 28.9% |
| From discrete GUsxfield | 4.2% | 2.7% | 0.0% | 26.8% |
| From either notes or GU field | 6.8% | 4.1% | 0.0% | 40.2% |
ASB: asymptomatic bacteriuria, LOS: length of stay; UCx: urine culture; BCx: blood culture; WBC: white blood cell; NLP: natural language processing; GU: genitourinary