Assertion: placebo | /r/HasProperty | 1.3% more power
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text: A dose-response relationship was evident in experimental trials, with subjects producing 1.4% less power than at baseline when they believed they had ingested a placebo (−4.6 to 1.9%), 1.3% more power than at baseline when they believed they had ingested 4.5 mg·kg −1 caffeine (−1.4 to 4.1%), and 3.1% more power than at baseline when they believed they had ingested 9.0 mg·kg −1 caffeine (−0.4 to 6.7%).