Two hundred twenty-eight women were divided into either an acupuncture group or a control group. The acupuncture group received treatment three times around embryo transfer during in vitro fertilization. The control group received sham acupuncture with placebo needles. The pregnancy rate was 31% in the acupuncture group and 23% in the control group. This is not considered statistically significant but a later study suggests that sham acupuncture (although not as effective as the true acupuncture) still has a positive effect on outcomes.