Figure 1From: Comparison of preoperative tramadol and pethidine on postoperative pain in cats undergoing ovariohysterectomySerum cortisol. Serum cortisol measured in different moments of the study. *Value significantly different (p <0,05) from TIND for that group. †Value very significantly different (p <0,01) from TIND. Letters means values significantly different among the groups in each time point, as b > a.Back to article page