Between-group difference in mean RMDQ improvement for cyclobenzaprine vs placebo was 0.3 ( 98.3 % CI , -2.6 to 3.2 ; P = .77 ) , for oxycodone/acetaminophen vs placebo , 1.3 ( 98.3 % CI , -1.5 to 4.1 ; P = .28 ) , and for oxycodone/acetaminophen vs cyclobenzaprine , 0.9 ( 98.3 % CI , -2.1 to 3.9 ; P = .45 ) .