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Table 2 Symptom scores All scores were obtained using a 5 category verbal rating scale score (scores; 1–5). All results are given as mean (SD). No significant differences in scores were observed between trial days.

From: Day-to-day variations during clinical drug monitoring of morphine, morphine-3-glucuronide and morphine-6-glucuronide serum concentrations in cancer patients. A prospective observational study

  Trial day 2 Trial day 3 Trial day 4
Pain 2.8 (0.7) 2.2 (1.1) 2.2 (1,1)
Nausea 1.7 (1.0) 1.7 (1.1) 1.8 (0.9)
Sedation 3.4 (1.2) 3.4 (1.0) 3.2 (1.1)