Effectiveness and cost-effectiveness of cognitive behavior therapy-enhanced compared with treatment-as-usual for anorexia nervosa in an inpatient and outpatient routine setting: a consecutive cohort study

Abstract

Background: For anorexia nervosa, firm evidence of the superiority of specialized psychological treatments is limited and economic evaluations of such treatments in real world settings are scarce. This consecutive cohort study examined differential (cost-)effectiveness for adult inpatients and outpatients with anorexia nervosa, after implementing cognitive behavioral therapy-enhanced (CBT-E) throughout a routine setting. Methods: Differences in remission, weight regain and direct eating disorder treatment costs were examined between one cohort (N = 75) receiving treatment-as-usual (TAU) between 2012–2014, and the other (N = 88) CBT-E between 2015–2017. The economic evaluation was performed from a health care perspective with a one-year time horizon, using EDE global score < 2.77, the absence of eating disorder behaviors combined with a BMI ≥ 18.5, as effect measure. Incremental cost-effectiveness ratios were calculated and cost-effectiveness planes and cost-effectiveness acceptability curves were displayed to assess the probability that CBT-E is cost effective compared to TAU. Results: Using direct eating disorder treatment costs in the cost-effectiveness analysis, the cost-effectiveness plane of the base case scenario for all patients indicated a 84% likelihood of CBT-E generating better health gain at additional costs. The median ICER is €51,081, indicating a probable preference for CBT-E (> 50% probability of cost-effectiveness) assuming a WTP of €51,081 or more for each additional remission, On remission, no difference was found with 9.3% remission during TAU and 14.6% during CBT-E (p =.304). Weight regain was higher during CBT-E (EMD = 1.33 kg/m2, SE =.29, 95% CI [0.76–1.9], p