Table 3.
Bayes factor analysis for time of TT-test execution and average power output among caffeine supplementation conditions.
| Experimental condition | Prior odds | Posterior odds | BF10, U | Probability % | |
|---|---|---|---|---|---|
| Time (s) | |||||
| PP | PC | 0.587 | 3.574 | 6.084M | 85.9 |
| PP | CC | 0.587 | 6.889 | 11.728S | 92.1 |
| PC | CC | 0.587 | 0.164 | 0.280a | 21.9 |
| Average power output (W) | |||||
| PP | PC | 0.587 | 14.862 | 25.301S | 96.2 |
| PP | CC | 0.587 | 47.066 | 80.125V | 99.8 |
| PC | CC | 0.587 | 0.103 | 0.175a | 14.9 |
The posterior odds have been corrected for multiple testing by fixing to 0.5 the prior probability that the null hypothesis holds across all comparisons (Westfall, Johnson, & Utts, 1997). Individual comparisons are based on the default t test with a Cauchy (0, r = 1/sqrt(2)) prior. The “U” in the Bayes factor denotes that it is uncorrected (PP: Placebo–Placebo; PC: Placebo–Caffeine; CC: Caffeine–Caffeine). Letters indicate the outcome classified as: A = anecdotal; M = moderate; V = very strong; E = extreme favoring the alternative hypothesis; a = anecdotal; m = moderate favoring the null hypothesis.