Table 1 List of pregnancy complications considered, key terms used to develop the search strategy and information extracted from systematic reviews

Pregnancy loss (miscarriage and stillbirth), hypertensive disorders of pregnancy (gestational hypertension, eclampsia, preeclampsia, HELLP (hemolysis, elevatated liver enzymes, and low platelets) syndrome), placental disorders (placenta previa, abruption, accreta, percreta), hyperemesis gravidarum, GDM, ectopic pregnancy, molar pregnancy, multiple pregnancy, obstetric haemorrhage, pre-term birth, mode of delivery, low birth weight (including small-for-gestational age, intra-uterine growth retardation, foetal growth restriction), post-partum depression, puerperal psychosis, perineal trauma, obstetric cholestasis and pelvic girdle pain.

Pregnancy complications OR pregnancy loss OR miscarriage OR stillbirth OR hypertensive disorders of pregnancy OR gestational hypertension OR eclampsia OR preeclampsia OR HELLP (hemolysis, elevated liver enzymes, and low platelets) syndrome OR placental previa OR placental abruption OR placenta accreta OR placenta percreta OR hyperemesis gravidarum OR gestational diabetes mellitus OR ectopic pregnancy OR molar pregnancy OR multiple pregnancy OR obstetric haemorrhage OR pre-term birth OR mode of delivery OR low birth weight OR small for gestational age OR intra-uterine growth retardation OR fetal growth restriction OR postpartum depression OR perineal psychosis OR pelvic girdle pain AND (type 2 diabetes OR hypertension).

Authors; year of publication; geographical area; aim of the review; databases searched; search period; population; health care setting; exposures; comparator; outcomes; covariates; study design; definitions of exposures and outcomes; data synthesis methods; quality assessment tool used; number of studies included in both qualitative and quantitative analysis; summary estimates and 95% confidence intervals and authors conclusions.