Table 2.
Univariate analysis independent variables in the general presenting population compared to presentations resulting in frequent readmissions 2008.
| Variable group | Variable | General presenting population N = 21956 | Presentations resulting in frequently readmissions N = 227 |
| ICD9 diagnostic code2 | Dyspnoeas (ICD 78609) | 2.3% | 15.9% p < 0.013 |
| Neurotic disorder (ICD 3079) | 3.4% | 10.6% p < 0.01 | |
| Chest pain (ICD 78650) | 4.4% | 9.7% p < 0.01 | |
| Chronic obstructive pulmonary disease (ICD 496) | 0.7% | 7% p < 0.01 | |
| Congestive heart failure (ICD 4280) | 0.3% | 2.6% p < 0.01 | |
| All other ICD codes | 89.0% | 54.2% p < 0.01 | |
| Triage category | Urgent (Triage 1 & 2) | 5.9% | 15.4% p < 0.01 |
| Visit type | Unplanned return visit | 4.3% | 8.8% p < 0.01 |
| Season of arrival | Autumn | 24.9% | 30.4% NS |
| Winter | 24.3% | 28.6% NS | |
| Spring | 25.0% | 28.6% NS | |
| Summer | 25.8% | 12.3% p < 0.01 | |
| Day of arrival | Weekend | 31.2% | 28.2% NS |
| Time of arrival | After hours | 49.0% | 44.9% NS |
| Ambulatory Care Sensitive Conditions4 | ACS rapid onset | 3.9% | 4.8% NS |
| ACS chronic | 1.3% | 7.5% P < 0.01 | |
| ACS other | 94.8% | 87.7% P < 0.01 |
2There were 1004 other ICD 9 codes with at least one presentation.
3Chi square results.
4ACS preventable was excluded because there was only one presentation in the general presenting population and none in the presentations resulting in frequent readmissions group.