Ordinary least squares (OLS) regression results (length of stay)
| Length of stay (n=291) | Coefficient | SE | P value |
| Comorbidities | |||
| Prior valve surgery | 8.260* | 3.442 | 0.017 |
| Heart failure | 5.500* | 2.368 | 0.021 |
| Other variables | |||
| Total number of episodes | 6.219** | 0.897 | <0.001 |
OLS regression using length of stay as the outcome variable. The results of the OLS regression using length of stay as the outcome variable are summarised in table 5. Coefficients should be interpreted as the absolute change in the number of bed days associated with a one unit increase in the value of the explanatory variable.
*P<0.05; **p<0.01; only variables that were significant at the 5% significance level are included.