This study was carried out with the aim of comparing pain responses of children who receive intramuscular (IM) vaccination in deltoid muscle versus the pain responses of those who receive IM vaccination in the vastus lateralis. A total of 185 infants were randomly assigned to one of the two study groups. The deltoid group and the vastus lateralis group were vaccinated respectively in the deltoid muscle and the vastus lateralis. Our results indicated that pain response of infants was similar in each group. However, crying duration of the children who received the vastus lateralis vaccination was shorter than that of the deltoid group after the procedure.
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