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Number of patients and their estimation of the perceived pain intensity before (white bar) and during/after (black bar) delta 9-THC therapy by means of (a) Verbal Rating Scale (VRS) and (b) Numeric Rating Scale (NRS). Values of the VRS indicate “no pain” (0), “slight pain” (2), “moderate pain” (4), “intense pain” (6), “very strong pain” (8), “worst pain imaginable (10). The endpoints of the NRS indicate “no pain” (0) and “worst pain imaginable” (10).
