Figure 6.

Mean (standard error, SE) pain now scores in the evening during the sustained-release (SR) phase. Pain was rated using the 11-point Brief Pain Inventory (BPI), ranging from 0 (no pain) to 10 (worst pain imaginable). CR, controlled-release.

Hanna et al. BMC Palliative Care 2008 7:17   doi:10.1186/1472-684X-7-17
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