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- Title
Projecting effectiveness after ending a randomized controlled trial: a two-state Markov microsimulation model.
- Authors
Yuan, Fei; Bangdiwala, Shrikant I.; Tong, Wesley; Lamy, Andre
- Abstract
<bold>Objective: </bold>To investigate the behavior of restricted mean survival time (RMST) and designs of a two-state Markov microsimulation model through a 2 × 4 × 2 full factorial experiment.<bold>Method: </bold>By projecting patient-wise 15-year-post-trial survival, we estimated life-year-gained between an intervention and a control group using data from the Cardiovascular Outcomes for People Using Anticoagulation Strategies Study (COMPASS). Projections considered either in-trial events or post-trial medications. They were compared based on three factors: (i) choice of probability of death, (ii) lengths of cycle, and (iii) usage of half-a-cycle age correction. Three-way analysis of variance and post-hoc Tukey's Honest Significant Difference test compared means among factors.<bold>Results: </bold>When both in-trial events and post-trial study medications were considered, monthly, quarterly, or semiannually were not different from one other in projected life-year-gained. However, the annual one was different from the others: mean and 95 percent confidence interval 252.2 (190.5-313.9) days monthly, 251.8 (192.0-311.6) quarterly, 249.1 (189.7-308.5) semiannually, and 240.8 (178.5-303.1) annually. The other two factors also impacted life-year-gained: background probability (269.1 [260.3-277.9] days projected with REACH-based-probabilities, 227.7 [212.6-242.8] with a USA life table); half-a-cycle age correction (245.5 [199.0-292] with correction and 251.4 [209.1-293.7] without correction). When not considering post-trial medications, only the choice of probability of death appeared to impact life-year-gained.<bold>Conclusion: </bold>For a large trial or cohort, to optimally project life-year-gained, one should consider using (i) annual projections, (ii) life table probabilities, (iii) in-trial events, and (iv) post-trial medication use.
- Subjects
MARKOV processes; RANDOMIZED controlled trials; LIFE tables; FACTORIAL experiment designs; MICROSIMULATION modeling (Statistics); ANALYSIS of variance; PROBABILITY theory
- Publication
International Journal of Technology Assessment in Health Care, 2020, Vol 36, Issue 4, p317
- ISSN
0266-4623
- Publication type
journal article
- DOI
10.1017/S0266462320000446