All 4 faces pain scales were found to be adequately supported by psychometric data .
When given a choice between faces scales , children preferred the WBFPRS .
Confounding of pain intensity with affect caused by use of smiling and crying anchor faces is a disadvantage of the WBFPRS .
: For clinical use , we found no grounds to switch from 1 faces scale to another when 1 of the scales is in use .
CONTEXT : Numerous faces scales have been developed for the measurement of  pain intensity in children .
It remains unclear whether any one of the faces scales is better for a particular purpose with regard to validity , reliability , feasibility , and preference .
OBJECTIVES : To summarize and systematic ally review faces pain scales most commonly used to obtain self-report of pain intensity in children for evaluation of reliability and validity and to compare the scales for preference and utility .
Comparison of ropivacaine with bupivacaine and lidocaine for ilioinguinal block after ambulatory inguinal hernia repair in children.
BACKGROUND We have compared ropivacaine with bupivacaine and lidocaine for ilioinguinal block in thirty children undergoing ambulatory inguinal hernia repair . METHODS Patients were assigned r and omly to receive 0.5 ml.kg(-1 ) of 0.2 % ropivacaine ( Group R , n = 10 ) , 0.25 % bupivacaine ( Group B , n = 10 ) or 1 % lidocaine ( Group L , n = 10 ) . The patients ' parents , who were not informed of the type of local anaesthetic employed , evaluated the postoperative pain at 2 h and 6 h after operation using the Wong-Baker FACES Pain Rating Scale . RESULTS There was a significant difference in the face scale score between Group R and Group L , and Group B and Group L. There was no difference in the face scale score between Group R and Group B. There were no complications or clinical evidence of local anaesthetic toxicity . CONCLUSIONS We have confirmed that bupivacaine and ropivacaine are more effective than lidocaine in the prevention of postoperative pain after children 's inguinal hernia repair . We suggest that ropivacaine 0.2 % is an alternative to bupivacaine 0.25 % for ilioinguinal block in ambulatory paediatric surgery
All 4 faces pain scales were found to be adequately supported by psychometric data .
When given a choice between faces scales , children preferred the WBFPRS .
Confounding of pain intensity with affect caused by use of smiling and crying anchor faces is a disadvantage of the WBFPRS .
: For clinical use , we found no grounds to switch from 1 faces scale to another when 1 of the scales is in use .
CONTEXT : Numerous faces scales have been developed for the measurement of  pain intensity in children .
It remains unclear whether any one of the faces scales is better for a particular purpose with regard to validity , reliability , feasibility , and preference .
OBJECTIVES : To summarize and systematic ally review faces pain scales most commonly used to obtain self-report of pain intensity in children for evaluation of reliability and validity and to compare the scales for preference and utility .