Table 5.

Correlation between post-operative pain, opioid use, and endocannabinoid levels (Spearman correlation coefficients).

	PDQ	NRS Pain 12 hrs	NRS Pain 24 hrs	Opioid Usage 12 hrs	Opioid Usage 24 hrs
PEAser	0.25	0.07	−0.03	0.03	−0.12
OEAser	0.20	0.04	−0.05	0.09	−0.02
AEAser	0.06	−0.08	−0.15	0.04	−0.02
2-AGser	−0.06	0.18	0.13	0.25	0.23
PEAcsf	0.11	−0.10	−0.02	−0.26	−0.23
OEAcsf	0.15	0.07	0.14	−0.04	−0.14
AEAcsf	0.18	0.12	0.12	0.05	−0.14
2-AGcsf	0.13	0.27	0.33	0.13	0.00
PEAsyn	0.44a	0.17	−0.04	0.11	−0.13
OEAsyn	0.26	0.18	−0.03	0.15	−0.18
AEAsyn	0.08	0.03	0.07	−0.13	−0.06
2-AGsyn	−0.04	0.42a	0.35	0.55b	0.52a

^ap < 0.05

^bp < 0.01

PDQ=Pain disability Score; NRS=Numerical rating scale. Opioid usage defined as morphine equivalent dose (mg) over first 12 hrs and 24 hrs post-operatively.