Table 2.

Blinding

Actual allocation	Group to which participants believed they were allocated
	Control group		Acupuncture group		No idea		P value
Acupuncture group (n=39): n; % (95% CI)	5	13% (4–27)	8	10% (9–37)	26	66% (50–81)	0.36*
Control group (n=40): n; % (95% CI)	7	18% (7–33)	5	13% (4–27)	28	70% (54–83)

^*Pearson’s chi square test.

In a follow-up telephone interview, the participants were asked whether they knew to which group they had been allocated.