By the ROC analysis in TRA group , a level of BMI < 24.3 kg/m2 predicted unacceptable pain with a 87.3 % sensitivity and 91.6 % specificity [ area under curve ( AUC ) : 0.875 , 95 % CI : 0.839-0 .906 , p < 0.0001 ] , while a wrist circumference < 16.7 cm predicted unacceptable pain with 84.6 % sensitivity and 89.8 % specificity ( AUC : 0.900 , 95 % CI : 0.867-0 .928 , p < 0.0001 ) .