Data extraction
All of the potentially relevant literature were reviewed independently
by two investigators and consensus was reached on all of the items. Any
disagreements were resolved by discussion or with involvement of a third
review author. CPR (presence of at least one gestational sac or fetal
heartbeat, confirmed by transvaginal ultrasound) and LBR (a baby born
alive after 24 weeks gestation) were the primary outcomes, and the
secondary outcomes were ongoing pregnancy rate (OPR, pregnancy beyond 12
weeks of gestation, as confirmed by fetal heart activity on
ultrasound),miscarriage rate (MR) and adverse events related to
acupuncture. The following information was also needed: first author and
published year, sample size, age of the study participants, acupuncture
sessions or timing.