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 .
Efficacy of ShotBlocker in reducing pediatric pain associated with intramuscular injections.
OBJECTIVE The aim of the study was to determine the efficacy of ShotBlocker ( Bionix , Toledo , Ohio ) in reducing  pediatric pain with intramuscular ( IM ) injections .  METHODS A prospect i ve r and omized controlled trial was conducted in children aged 2 months to 17 years who required an IM injection . Children were r and omized to the no-intervention group or the ShotBlocker group . Demographic data and the number of IM injections were recorded . Perceived pain scores were obtained from nurses and caregivers using a 6-point Likert-type scale . Baker Wong Faces scale was used in children 36 months or older .  Difficulty using the device was also rated by nurses on a 6-point scale . RESULTS One hundred sixty-five children were enrolled with 80 in the no-intervention arm and 85 in the ShotBlocker arm . The mean age of children was 45 months and 56 % were male .  Perceived pain scores by nurses were higher for the no-intervention group ( 2.6 vs 1.8 , P < .001 ) as well as by caregivers ( 2.6 vs 2.1 , P = .04 ) . Children aged 36 months and older ( n = 64 ) did not report a difference in pain scores ( 1.5 vs 1.3 , P = .6 ) ; however , in a subgroup of children 72 months or older , pain scores trended higher in the no-intervention group ( 1.3 vs 0.5 , P = .051 ) . Nurse-perceived difficulty of ShotBlocker use was low 1.39 ( + /-1.1 ) . CONCLUSIONS Nurses and caregivers noted lower pain scores in children assigned to the ShotBlocker group . These differences were not as evident when children rated their own pain
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 .