Relationships between temperature parameters and effects of sympathetic blocks. Box plots and scatter plots of (A) preprocedure temperature in the involved extremity and (B) preprocedure temperature difference between the involved and contralateral extremity (involved limb temperature minus contralateral limb temperature) for patients who had successful (more than 50%) pain reduction after the procedure (n = 185) and patients who did not (n = 133). The first quartile, median, and third quartile comprise the boxes; the diamond symbol in the box represents the mean; whiskers extend to the most extreme observations within 1.5 times the interquartile range of the first and third quartiles, respectively; points outsides these whiskers are displayed individually.