The researcher screened department’s operation plan lists
every week and counted patients who might meet the inclusion
criteria. Prior to the day of surgery, the researcher familiarised
herself with the patient’s papers that estimated exclusion and
inclusion criteria and examined the final operation and
anaesthetic plan. The researcher interviewed and informed
patients and told them whether they belonged to the music
group or the control group prior to the day of surgery. The
interview lasted from half an hour to an hour and a half.