Univariate association between OFA and time to first opioid rescue in postoperative period.

Table 5: Univariate association between OFA and time to first opioid rescue in postoperative period.

Variable	Hazard Ratio (95% CI)	P-Value
OFA	1.23 (0.85-1.79)	0.26
Age (per year)	0.98 (0.97-0.99)	0.02
Sex (Female)	0.86 (0.58-1.28)	0.47
Race AA	1.32 (0.95-1.83)	0.09
BMI (per unit)	1.00 (0.99-1.03)	0.48
OSA	0.84 (0.61-1.16)	0.30
ASA PS (3 or higher)	0.75 (0.53-1.06)	0.10
Chronic pain history	0.83 (0.55-1.25)	0.37
Adjusted OFA^*	1.33 (0.91-1.93)	0.14

*Adjusted for the baseline characteristics of age, race, ASA PS of 3 or higher (p < 0.2).