Peterson Kristopher B, Peterson Caroline D
Director, Peterson Clinic, Hermiston, OR 97838.
J Chiropr Med. 2012 Mar;11(1):1-6. doi: 10.1016/j.jcm.2011.06.010.
The purpose of this study was to evaluate if manual muscle testing (MMT) could identify fetal sex in women who did not know the sex of their babies. The null hypothesis was that MMT is no more accurate than chance.
A prospective case series of 27 sequential pregnant patients who did not know the sex of their fetus were included in this study. The examiner was also blind to the sex of the fetus. Manual muscle testing was evaluated after the mother stated "I am having a boy." Likelihood ratios, specificity, sensitivity, positive predictive value, and negative predictive value were calculated.
Fourteen girl babies and 13 boy babies were born. Manual muscle testing accurately predicted the sex 13 times. The positive likelihood ratio was 0.92 (95% confidence interval, 0.42-2.03), sensitivity was 0.40, specificity was 0.54, positive predictive value was 0.46, and negative predictive value was 0.44.
Manual muscle testing was no better than chance at predicting fetal sex in this case series.
本研究旨在评估徒手肌力测试（MMT）能否在孕妇不知胎儿性别的情况下识别胎儿性别。无效假设是MMT并不比随机猜测更准确。
本研究纳入了27例连续的、不知胎儿性别的孕妇的前瞻性病例系列。检查者也不知道胎儿性别。在母亲说出“我怀的是男孩”后进行徒手肌力测试评估。计算似然比、特异性、敏感性、阳性预测值和阴性预测值。
共出生14名女婴和13名男婴。徒手肌力测试准确预测胎儿性别13次。阳性似然比为0.92（95%置信区间，0.42 - 2.03），敏感性为0.40，特异性为0.54，阳性预测值为0.46，阴性预测值为0.44。
在该病例系列中，徒手肌力测试在预测胎儿性别方面并不比随机猜测更好。
