Interactive sections of an Internet-based intervention increase empowerment of chronic back pain patients: randomized controlled trial.

For medication misuse, the differences were as expected and highly significant, meaning that interactivity clearly helped to curb this deteriorating behavior both at midterm assessment (mean difference=−1.5, P =.04, d =0.28) and final assessment (mean difference=−1.6, P =.03, d =−0.55).

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