Document Classification

Section Type: RESULTS

Text: The placebo effect on area-under-the-curve of energy (mean difference) and sleepiness (geometric mean ratio) was larger than placebo-plus-interaction effect (16. 6 [95 % CI, 4. 1 to 29. 0] vs. 8. 4 [-4. 2 to 21. 0] mm * hr and 0. 58 [0. 39 to 0. 86] vs. 0. 69 [0. 49 to 0. 97], respectively), similar in size to drug effect (20. 8 [3. 8 to 37. 8] mm * hr and 0. 49 [0. 30 to 0. 91], respectively), and its combination with the later was larger than total caffeine effect (29. 5 [11. 9 to 47. 1] mm * hr and 0. 37 [0. 22 to 0. 64]).