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Pain scores are plotted as mean and SEM before and at various time intervals after intramuscular (IM) injection of 1 000 mg testosterone undecanote (TU) in 4-mL castor oil vehicle into the upper outer quadrant of the buttock region. The two plots correspond to men with or without a history of pain with earlier TU injections. Dotted line represents overall mean pain score for the whole study.
