Fig. 3From: Reconceptualizing autonomic function testing in migraine: a systematic review and meta-analysisFixed-effect meta-analysis main effect Forrest plot of Valsalva manoeuvre (expressed as Valsalva ratio); where left of 0 favours sympathetic adrenergic and cardiovagal dysfunction and right of 0 favours normal sympathetic adrenergic and cardiovagal functionBack to article page