OBJECTIVE:To evaluate the factors related to adult observers that interfere on their recognition of facial expression of pain in term newborn infants. METHODS:405 adults were interviewed: 191 health professionals and 214 parents. Adults' demographic and socio-economical characteristics were surveyed. At the end of the interview, each adult looked at three series of pictures of three different newborns, each series with eight pictures of the face of each newborn, in eight different moments (M1, M3, M6 e M8: resting; M2: light stimulus; M4 and M5: heel rubbing; M7: heel stick) and answered to the following question: In which picture of these do you think the newborn is feeling pain? The 405 adults were analyzed according to the number of right answers for the three series of pictures by multiple linear regression analysis. RESULTS:A smaller number of right answers in the three series of pictures was noticed to adults without a partner, with more children, higher family income and, if health professionals, with less years in school or, if parents, with more years in school. Adults with these characteristics, therefore, presented more difficulty to recognize the expression of pain in the newborn's face. CONCLUSIONS:The heterogeneity of factors that interfere in the recognition of neonatal pain by adults emphasizes the need of using validated pain assessment tools in the care of critically ill neonates.
infant; newborn; pain; facial expression
