Key result
O'Brien two-sample tests were more appropriate than conventional tests for analyzing exercise tolerance time, identifying subgroups with pronounced experimental therapy effects.
Why the study?
Are O'Brien two-sample tests more appropriate than conventional tests for analyzing exercise tolerance time in heart failure trials with heterogeneous treatment effects?
RCT (n=230)
double-blind
randomized
Are O'Brien two-sample tests more appropriate than conventional tests for analyzing exercise tolerance time in heart failure trials with heterogeneous treatment effects?
O'Brien two-sample tests may be superior to conventional tests for analyzing clinical trial data with heterogeneous treatment effects.
Answers are grounded in this paper and cite their sources.
O'Brien tests merit preference over conventional methods for exercise tolerance in heterogeneous HF trials; extends subgroup detection in RCT analyses.
In a randomized placebo-controlled double-blind trial of 230 congestive heart failure patients, four treatments were evaluated for efficacy, with exercise tolerance time (ETT) as the primary outcome. Various two-sample tests were applied to the analysis of ETT data. It is shown in this paper that the conventional two-sample tests (t and rank-sum) are insensitive to situations where the effect of the experimental therapy is not consistent across a patient population. Tests recommended by O'Brien are more appropriate for these data. It is also shown that the application of the O'Brien tests led to the identification of sub-groups where the observed effect of the experimental therapy was most pronounced.
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Tandon et al. (1990) conducted an RCT in congestive heart failure (n=230). experimental therapy vs. placebo was evaluated on exercise tolerance time (ETT). O'Brien two-sample tests were more appropriate than conventional tests for analyzing exercise tolerance time, identifying subgroups with pronounced experimental therapy effects.
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