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 .
Pain response to M-M-R vaccination in 4-6 year old children.
BACKGROUND Differences in pain response to two different M-M-R products have previously been demonstrated in 12-month old infants and in 4 â 6 year old children . Objective To determine if the acute and immediate pain response to two licensed M-M-R vaccine products ( using a self-report measure ) in children 4 - 6 years of age was similar to that demonstrated in younger infants . METHODS R and omized , double blind , study . Subjects were r and omly allocated to PriorixA ( SmithKline Beecham ) or M-M-R IIA ( Merck Frosst ) . The primary outcome measure was pain response to vaccination quantified using a self-report OUCHER pain scale . Secondary outcome measures included pain measurement by proxy ( physician and parent ) using a visual analog scale ( VAS ) and measurement of cry and cry duration immediately post-vaccination . RESULTS Of the 60 subjects enrolled , 30 received PriorixA and 30 received M-M-R IIA . There were no significant differences between the two groups on age , sex , or previous painful procedure . Post-vaccination , children in the M-M-R IIA group had higher median pain scores compared with children in the PriorixA group for VAS ( 12.5 vs. 2.0 , respectively by paediatricians , p=0.017 ; 18.5 vs. 5.0 , respectively by parents , p=0.235 ) , OUCHER ( 20 vs. 0.00 , respectively , p=0.047 ) . The median duration of crying post M-M-R IIA was higher compared with PriorixA ( 6 vs. 0 seconds , respectively , p=0.020 ) . Conclusion PriorixA was associated with significantly less pain compared with M-M-R IIA , at the time of injection
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 .