Demographic data and prior experience of clinical pain.

1Values between brackets are standard deviations. 2One male participant had taken analgesic within one month before the study, due to a sore throat. 3One female participant had taken analgesics due to migraine for more than one year. The migraine had ceased to occur at the time of the study. 4Maximal intensity of clinical pain were made on 0–10 numerical rating scale (0 = no pain, 10 = extremely painful). Demographic data and prior experience of clinical pain.