Trait responsiveness to verbal suggestions predicts nocebo responding: A meta-analysis.

Similarly, studies that implemented participant condition blinding and experimenter blinding of condition, suggestibility level and nocebo response ( k = 7) demonstrated a larger and highly significant effect size, Z r = .37 [.16, .58], Z = 3.46, p < .001, equivalent to r = .35, with only a minor decrease in heterogeneity, I 2 = 76% and τ 2 = .05.

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