Table 4. Potential predictors of placebo Tylenol response using pain threshold as outcome.

	Univariate Model		Multivariate Model
Variable	Coef.	P-val	Coef.	P-val
Sham acupuncture Score Change	0.13	0.34	0.15	0.40
Electroacupuncture Score Change	0.03	0.80	0.05	0.69
Rest Score Change	−0.13	0.28	−0.13	0.45
Electroacupuncture Expectancy	−0.09	0.40	−0.01	0.95
Sham acupuncture Expectancy	0.00	0.99	0.00	0.98
Placebo Tylenol Expectancy	0.05	0.63	0.12	0.38
Rest Expectancy	−0.12	0.31	−0.16	0.36
Age	0.03	0.67	0.05	0.62
Male	0.21	0.64	0.30	0.63
Optimism	−0.01	0.90	0.01	0.89