Duration of Observation Substance-P Level (pg/ml) P value
Pregabalin Group (n=26) Control Group (n=26)
Min–Max Median Min-Max Median
Before Surgery 11-185 48.5 6-154 60.5 p=0.510
1hr  After Surgery 2.3-173.5 19.3 23.6-205.6 59.6 p=0.000*
Data are shown in minimal, maximal and mean value, deviation standard and probability were tested with Mann Whitney-U test, p<0.05 is significant. *P value<0.05.
Table 3: Substance-P level alteration between two groups.