Fig. 1. Morphine consumed (in milligrams) in specific time intervals following total hip arthroplasty. Patients receiving 40 mg parecoxib sodium required significantly less morphine during the 6- to 9-, 9- to 12-, 12- to 18-, 18- to 24-, and 24- to 36-h time intervals, and patients receiving 20 mg parecoxib sodium required significantly less morphine during the 12- to 18-h interval than those taking placebo (*P < 0.05).