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Forest plots showing the effect of tramadol (25 mg vs. 50 mg, 25 mg vs. 100 mg, 50 mg vs. 100 mg, 62 mg vs. 89 mg, and 50 mg vs. 20 mg paroxetine) in terms of intravaginal ejaculatory latency time for patients with premature ejaculation.
Note. SD = standard deviation; IV = inverse variance; CI = confidence interval; df = degrees of freedom.
