Yassaee 2014.

Methods	2‐arm no treatment‐controlled randomised trial.
Participants	60 women were randomised in a hospital setting in Iran. The population comprised pregnant women with threatened abortion. The presence of singleton pregnancy and detection of fetal heart activity, besides gestational age of < 20 weeks, was verified by ultrasound. Exclusion criteria comprised women that had reaction to Cyclogest, repeated abortions, multiple gestation, absence of fetus or fetal heart tone, uterine anomaly or fetal anomaly.
Interventions	400 mg micronized vaginal progesterone daily until their bleeding stopped in less that 1 week versus no treatment.
Outcomes	The study recorded the following outcomes relevant for this review: live birth and miscarriage.
Notes	Evidence of trial documentation and data requested from the corresponding author, who replied but did not answer all of our queries or provide the requested documentation or data.

hCG: Human chorionic gonadotropin.