The Preventive Value of Acupoint Sensitization for Patients with Stable Angina Pectoris: A Randomized, Double-Blind, Positive-Controlled, Multicentre Trial

Table 2

Between-group comparison of the frequency of angina attacks at different study phases.

Study phase	Frequency of attacks (mean ± SD)		Adjusted model^1
	HSG	LSG	HSG vs. LSG
			IRR (95% CI)^2	value
Baseline	6.31 ± 5.75	5.49 ± 4.55	—	—
Week 4	2.96 ± 3.42	3.69 ± 3.88	0.691 (0.569, 0.839)	0.002
Week 8	2.81 ± 3.48	3.60 ± 3.68	0.692 (0.568, 0.841)	0.002

HSG: high-sensitivity group; LSG: low-sensitivity group; IRR: incidence rate ratio; CI: confidence interval. ¹Adjusted model was constructed by a Poisson mixed model with treatment, time, and interaction between treatment and time as the fixed effects and centre and individuals as the random effects. ²Compared with baseline, the difference of change of angina attacks between groups was reflected by the incidence rate ratio.