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Relationship between steroid injection-decreased pain level

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A researcher studied the effect of epidural steroid injections for chronic lumbar pain. Patients eligible for the study were randomly assigned to two groups. One group received an epidural injection with the steroid and a local anesthetic. The second group received an epidural injection with the local anesthetic. It was found that the epidural injection of the steroid produced a decrease in pain level among the patients. Can the researcher claim there is a causal relationship between the steroid injection and decreased pain level?

Reference no: EM132465211

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