Patients, in this study, did not express their pain spontaneously. Their sedation level varied, which may be one reason why not all of them were able to use VAS or NRS to assess their pain. Especially in the first set of measurements, some of the patients were unable to assess their pain with VAS and NRS, or with either. In this study, the method of anaesthesia was standardized (Ferguson et al. 1997) so that all patients were in an equal position to assess their pain. The study by Bowman (1994) also pointed at surgical patients difficulties in assessing their pain, possibly because of their medication.
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