Subgroup analyses
SSI
SENSITIVITY
The subgroup analysis based on age (< 60 vs. > / = 60) showed cost-effectiveness for ODR when it comes to functional outcome for patients under 60 y/o. For every point difference on the OMAS, there was a difference of − €3,333 (− €8,253,179 to − €1,097) between ODR and RR with less expenses in the ODR group (Table The subgroup analysis which excludes patients with a SSI is specified in the supplementary content and had a mean difference in costs of €− 3226 (− €6822 to €370), mean difference in functional recovery by OMAS at 12 months of 1.34 (− 5.35 to 8.04) and a mean difference in QALY over 12 months of 0.014 (− 0.026 to 0.054). Costs, functional recovery and QALY were more favourable in the ODR group. The ICUR was -€230,542 (€− 219.210.538 to €54.613).Following sensitivity analyses, medical costs all showed a difference in costs between RR and ODR, in favour of ODR (Table Sensitivity analyses of medical costs per patient