Comparison of morphine, ketorolac, and their combination for postoperative pain: results from a large, randomized, double-blind trial.

Background:Meta-analyses report similar numbers needed to treat for nonsteroidal antiinflammatory drugs (NSAIDs) and opioids. Differences in baseline pain intensity among the studies from which these numbers needed to treat were derived may have confounded the results. NSAIDs have an opioid-sparing