Estimated total and subgroup cost 6 months following discharge with readmission
| Covariate* | AR (95% CI) | p value | BIC |
|---|---|---|---|
| Medical products; generalized linear model (Gaussian distribution) | 72 | ||
| Age (per 1-yr increase) | 1.09 (1.03–1.15) | 0.003 | |
| Clinical frailty score (per 1-pt increase) | 1.45 (1.03–2.06) | 0.036 | |
| Length of stay (per 1-d increase) | 1.07 (1.03–1.12) | 0.001 | |
| Married | 0.35 (0.15–0.84) | 0.017 | |
| Ostomy creation or modification | 3.59 (0.97–13.26) | 0.06 | |
| Readmitted at least once within 6 mo of discharge | 3.34 (1.36–8.22) | 0.009 | |
| Lost productive hours; zero-inflated model (chance patient is certain zero?) | 5 | ||
| Age (per 1-yr increase) | 1.11 (1.03–1.19) | 0.004 | |
| Charlson Comorbidity Index (per 1-pt increase) | 0.79 (0.50–1.23) | 0.30 | |
| Clinical frailty score (per 1-pt increase) | 2.13 (1.38–3.30) | 0.001 | |
| Nested negative binomial regression (cost if working before admission) | |||
| Age (per 1-yr increase) | 0.94 (0.88–1.01) | 0.11 | |
| Clinical frailty score (per 1-pt increase) | 0.42 (0.22–0.79) | 0.007 | |
| High-acuity bed postoperatively | 2.25 (0.99–5.11) | 0.05 | |
| Readmitted at least once within 6 mo of discharge | 0.75 (0.32–1.76) | 0.51 | |
| Male sex | 2.29 (1.06–4.98) | 0.036 | |
AR = adjusted ratio; BIC = Bayesian information criterion; CI = confidence interval.
↵* Age and location were forced into each model.
† Lower BIC values indicate better model fit.