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. 2012 Jan 9;2012:936960. doi: 10.1155/2012/936960

Figure 2.

Figure 2

Placebo response plotted against length of trial for 27 randomised controlled trials performed during 1976–1998. There are not enough data points between 3–6 months, but it appears that the placebo response increases and then decreases with time, peaking at 8 weeks. Modified from [7].