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Anti-TNFs have been shown to significantly improve the health-related quality of life (HRQoL) in Crohn's disease (CD) patients. The purpose of this study was to investigate to what extend the patients' preferences for these intravenous (IV) and subcutaneous (SC) treatments differ based on respondents' quality of life. An online discrete choice experiment (DCE) was conducted to understand patient trade-offs in treatment choice.Fifty-seven Crohn's disease anti-TNF naïve patients were asked to choose between two different scenarios, considering the following attributes: mode of administration (MODE), total availability for injection (TIME), speed of onset (DELAY), risk of anti-TNF administration despite a contraindication (RISK) and total monthly out-of-pocket expenses (COST). At the same time, patients completed the IBDQ-32 questionnaire. Conditional logit models without and with interaction terms were estimated to evaluate attribute weights.Patients preferred to self-administer SC anti-TNF rather than have a primary care nurse do it, whereas the preference for IV route was negative. After adding interaction terms however, the IV route became preferred for patients with impaired HRQoL, this preference having decreased as HRQoL increased. Surprisingly, patients with impaired HRQoL were less willing to spend more time on treatment, and this effect diminished as HRQoL (overall and in each dimension) became higher.HRQoL level changed patients' preferences for the anti-TNF treatment. The results suggest the need to optimise the management of IV infusions in the hospital and reinforce the importance of patient-reported outcome measures (PROMS) as a common practice to improve shared medical decision making.

Arnaud Cavailles,1 Boris Melloni,2 Stéphane Motola,3 Florent Dayde,3 Marie Laurent,3 Katell Le Lay,4 Didier Caumette,5 Laura Luciani,4 Pierre Louis Lleu,6 Geoffrey Berthon,7 Thomas Flament8 1Service de Pneumologie, Institut du Thorax, CHU de Nantes, Nantes, France; 2Service de Pneumologie, CHU Dupuytren, Limoges, France; 3HEVA, Lyon, France; 4HEOR/RWE, Boehringer Ingelheim, Paris, France; 5Institutional and Hospital Partnership, Boehringer Ingelheim, Paris, France; 6Medical Affairs, Boehringer Ingelheim, Paris, France; 7CHRU Tours, Tours, France; 8Service de Pneumologie, CHRU Bretonneau, Tours, FranceCorrespondence: Marie Laurent 186 Avenue Thiers, Lyon 69006, FranceTel +33 4 72 74 25 60Email mlaurent@hevaweb.comPurpose: To characterise patients with chronic obstructive pulmonary disease (COPD) who are rehospitalised for an acute exacerbation, to estimate the cost of these hospitalisations, to characterise high risk patient sub groups and to identify factors potentially associated with the risk of rehospitalisation.Patients and Methods: This was a retrospective study using the French NationalHospital Discharge Database. All patients aged ≥ 40 years hospitalised for an acute exacerbation of COPD between 2015 and 2016 were identified and followed for six months. Patients with at least one rehospitalisation for acute exacerbation of COPD constituted the rehospitalisation analysis population. A machine learning model was built to study the factors associated with the risk of rehospitalisation using decisiontree analysis. A direct cost analysis was performed from the perspective of national health insurance.Results: A totalof 143,006 eligible patients were hospitalised for an acute exacerbation of COPD (AECOPD) in 2015– 2016 (mean age: 74 years; 62.1% men). 25,090 (18.8%) were rehospitalised for another exacerbation within six months. In this study, 8.5% of patients died during or immediately following the index hospitalisation and 10.5% died during or immediately after rehospitalisation (p < 0.001). The specific cost of these rehospitalisations was € 5304. The overall total cost per patient of all AECOPD-related stays was € 9623, being significantly higher in patients who were rehospitalised (€ 16,275) compared to those who were not (€ 8208). In decisiontree analysis, the most important driver of rehospitalisation was hospitalisation in the previous two years (contributing 85% of the information).Conclusion: Rehospitalisations for acute exacerbations of COPD carry a high epidemiological and economic burden. Since hospitalisation for an acute exacerbation is the most important determinant of future rehospitalisations, management of COPD needs to focus on interventions aimed at decreasing the rehospitalisation risk of in order to lower the burden of disease.Keywords: comorbidity, rehospitalisation, decisiontree analysis, cost