After the injection area was determined in the VI group, the vibration device was held for 30 seconds in the area to be injected, then the injection was applied by pulling up 3 cm while the device was operating.

After the injection area was determined in the PI group, 30 seconds light pressure was applied with the thumb and then the injection was given

The routine IM injection was applied to the children in the control group.

The vibration frequency of the massager, which accelerates blood circulation, is 6000 / min, it works with a 1.5 volt battery. Can be used easily with one hand. The vibration simulator design is based on the gate-control theory, which allows for a reduction in the perceived amount of pain experienced during injection by closing the pain gate in the spinal cord in creating a stimulus on the skin.

The Children's Fear Scale (CFS) is a scale used to assess the level of anxiety in children. The scale is a visual measurement tool with scores ranging from 0-4 points. It consists of five facial expressions, ranging from a neutral to a frightened expression, and is suitable for use with children aged 5-10 years (Inan & Inal, 2019; McMurtry, Noel, Chambers, & McGrath, 2011; Özalp Gerçeker, Ayar, Özdemir, & Bektaş, 2018). The evaluation of the Turkish psychometric properties of the scale, which was developed by McMurty et al. for paediatric patients, was conducted by Özalp Gerçeker et al. (2018), and the scale was translated into the Turkish language (Özalp Gerçeker et al., 2018). The CFS has demonstrated good evidence of test-retest (r = 0.76, p < 0.001), and inter-rater (0.51, P < 0.001) reliability, as well as construct validity, (rs ¼ when used with children (McMurtry vd., 2011

The Children's Anxiety Meter-State (CAM-S) assesses children's anxiety at medical procedures. It is drawn like a thermometer with a bulb at the bottom. It includes horizontal lines going up to the top (0-10). Children are asked to mark their feelings "right now" to measure state anxiety (Kleiber & Mccarthy, 2006). CAM-S was validated in children aged 4-10 years during an intravenous procedure. It is significantly associated with all parent measures and observed distress ratings (Ersig et al., 2013). Gerçeker et al. (2018) conducted the psychometric properties of CAM-S in the Turkish population. They revealed a significant negative correlation between the CAM-S scores and children's ages (β = 0.340, p < .001).

It is a horizontal scale developed by Wong and Baker in 1983 for children over 3 years of age who can express themselves. In this scale, pain scores are given to faces according to numerical values. The lowest score is "0" and the highest score is "10". As the score obtained from the scale increases, the severity of pain increases. During the application of the scale, it is stated to the child that each of the facial expressions belongs to a person. It is stated that the child who has no pain expresses a happy face, while the child who has a little or a lot of pain during the procedure has sad faces.