Table 1.
CT-scan and VTE per 100 admissions or per 1,000-patient-days in the three periods.
| Period 1 February 28 to March 25 |
Period 2 March 26 to April 5 |
Period 3 April 6 to May 7 |
P a | P b | |
|---|---|---|---|---|---|
| VTE upon admission | |||||
| ceCT scan performed | 18 | 34 | 31 | <0.001 | 0.464 |
| VTE | 2 | 8 | 4 | 0.020 | 1.000 |
| Admissions | 185 | 145 | 113 | - | - |
| ceCT scan per 100 admissions | 9.7 | 23.4 | 27.4 | - | - |
| VTE per 100 admissions | 1.1 | 5.5 | 3.5 | - | - |
| VTE during hospitalization | |||||
| ceCT-scan performed | 10 | 20 | 56 | 0.328 | 0.041 |
| VTE | 2 | 14 | 11 | 0.016 | 0.056 |
| Patient days | 1111 | 1528 | 2543 | - | - |
| ceCT scan per 1,000-patient-days | 9.0 | 13.1 | 22.0 | - | - |
| VTE per 1,000-patient-days | 1.8 | 9.2 | 4.3 | - | - |
ceCT: contrast-enhanced computed tomography; VTE: venous thromboembolism. aComparison of periods 1 and 2. bComparison of periods 2 and 3.