Validation of Faces Thermometer Scale (FTS)

The Faces Thermometer Scale (FTS) is a one-item measure with 11 numeric rating scale steps (0, no pain to 10, much pain). Each step is associated with different faces and colors. The app presents all information in text, sound, and picture. FTS is part of PicPecc, an application for mobile devices. The child/adolescent assesses their pain on a tablet by moving the finger on the scale and points to the color and face that represent their appraised level of pain.