Table 2.

Comparison of the baseline characteristics of the non-opioid and opioid user cohorts

Baseline Characteristic	Non-opioid user (n = 824)	Opioid user (n = 359)	P value
Proportion	70%	30%	-
Female	62%	67%	0.067
Mean age (SD)	67.7 (9.6)	65.2 (10.4)	< 0.001
Mean BMI (SD)	32.6 (7.3)	35.4 (23.8)	0.040
TKA	74%	58%	< 0.001
Right side	50%	49%	0.64
Mean Oxford Score (SD)	15.9 (7.4)	12.7 (6.8)	< 0.001
ASA 1–2	64%	62%	0.88
ASA 3–4	36%	37%	0.80

SD Standard deviation. Bold values indicate statistical significance (P < 0.05)