Fluctuation of visual analog scale pain scores and opioid consumption before and after total hip arthroplasty

Table 2 Number of opioid pills consumed per day (N = 105, 564 observations)

Time	Average daily opioid use (SD)	Incidence rate ratio (95%CI)	P value
Preop	0.68 (1.29)	---	---
Postop days 1-7	1.51 (1.58)	2.43 (1.44, 4.10)	0.001
Postop days 8-14	1.00 (1.27)	1.76 (1.02, 3.03)	0.043
Postop days 15-30	0.35 (0.72)	0.66 (0.36, 1.18)	0.160

SD: Standard deviation; CI: Confidence interval.