2.4. Data collection
Data were collected at the first day of hospitalization before
surgery and each child strabismus patient was given informed
consent before participating. To reduce bias, participants
were given instructions in completing the Child-IXTQ and
PedsQL 4.0 before being left alone in a room. Fifty patients
were chosen randomly to complete Child-IXTQ for a second
time three days following the first survey.