Between-group difference in mean RMDQ improvement for cyclobenzaprine vs placebo was @ ( @ % CI , -@ to @ ; P = @ ) , for oxycodone/acetaminophen vs placebo , @ ( @ % CI , -@ to @ ; P = @ ) , and for oxycodone/acetaminophen vs cyclobenzaprine , @ ( @ % CI , -@ to @ ; P = @ ) .