The VAS-R and VAS-C values were lower in the TEA group in comparison to the LEA group at 2 , 4 , 8 , and 16 hours after surgery ( for VAS-R , P = 0.001 , P = 0.01 , P = 0.008 , and P = 0.029 , respectively ; and for VAS-C , P = 0.035 , P = 0.023 , P = 0.002 , and P = 0.037 , respectively ) .