Economic evaluation of an implementation strategy for the management of low back pain in general practice

In connection with the publication of a clinical practice guideline on the management of low back pain (LBP) in general practice in Denmark, a cluster randomised controlled trial was carried out. In this trial, a multifaceted guideline implementation strategy to improve general practitioners' treatment of LBP patients was compared with a usual implementation strategy. The aim was to determine whether the multifaceted strategy was cost-effective, as compared with the usual implementation strategy. The economic evaluation was conducted as a cost-utility analysis where cost collected from a societal perspective and quality-adjusted life years (QALY) were used as outcome measures. The analysis was conducted as a within trial analysis with a 12- month time horizon consistent with the follow-up period of the clinical trial. To adjust for a priori selected covariates, generalised linear models with a gamma family were used to estimate incremental costs and QALYs. Furthermore, both deterministic and probabilistic sensitivity analyses were conducted. Results showed that costs associated with primary health care were higher while secondary health care costs were lower for the intervention group when compared with the control group. When adjusting for covariates, the intervention was less costly and there was no significant difference in effect between the two groups. Sensitivity analyses showed that results were sensitive to uncertainty. In conclusion, the multifaceted implementation strategy was cost saving when compared with the usual strategy for implementing LBP clinical practice guidelines in general practice. Furthermore, there was no significant difference in effect, and the estimate was sensitive to uncertainty.