Individual percent change in stroke volume during passive leg raise for responders and non-responders. The dashed line represents the cutoff value of 15%. The squares represent the means with SD of the two groups (* P < 0.001, Bonferonni adjusted level of significance 0.01). PLR = passive leg raise; SV = stroke volume.
Thiel et al. Critical Care 2009 13:R111 doi:10.1186/cc7955