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Forest plot of the VNRS scores during the CPTs. Estimates (95% CI) of differences in VNRS scores. Estimates to the left of vertical solid line favour the first treatment group, and vice versa (Supplementary Table 2). CI, confidence interval; CPT, cold pressor test; F25, fentanyl 25 μg i.v.; F50, fentanyl 50 μg i.v.; M, methoxyflurane 3 ml; P, placebo; VNRS, verbal numeric rating scale.
