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Figure 2. Changes in the flow of saliva (the mean flow rate over the periods; i.e., baseline, dryness, and active treatment periods) vs. the subjects’ own estimations of changes in the flow of saliva after (a) tramadol treatment (dryness level compared with baseline level) in 60 subjects (n = 48 in "Decrement group"; n = 12 in "No change group") and after (b) pilocarpine/placebo treatment (treatment level compared with dryness level) in 34 subjects (n = 5 in "Decrement group"; n = 13 in "No change group"; n = 16 in "Increment group"). Each symbol represents one individual.
