Slow fetal heart rate may predict pregnancy outcome in first-trimester threatened abortion Apichart Chittacharoen, M.D., Yongyoth Herabutya, F.R.C.O.G. Fertility and Sterility Volume 82, Issue 1, Pages 227-229 (July 2004) DOI: 10.1016/j.fertnstert.2003.12.026
FIGURE 1 The distribution of the median fetal heart rate according to gestational age. Chittacharoen. Slow fetal heart rate in threatened abortion. Fertil Steril 2004. Fertility and Sterility 2004 82, 227-229DOI: (10.1016/j.fertnstert.2003.12.026)