It is very uncertain whether preconception lifestyle advice on weight changes miscarriage compared with routine care or attention control (very low certainty).
The review found no eligible studies for this question.
It is very uncertain whether preconception lifestyle advice on alcohol intake changes miscarriage compared with routine care or attention control (very low certainty).
The review found no eligible studies for this question.
Summary of findings table ‐ ICSI showed no clear difference in miscarriage compared with c‐IVF (moderate certainty).
It is very uncertain whether day 5 changes miscarriage compared with day 3 embryo biopsy (very low certainty).
Metabolomics showed no clear difference in miscarriage (Loss of pregnancy before 20 completed weeks of gestation) compared with non metabolomics (low certainty).
Letrozole with or without adjuncts showed no clear difference in miscarriage rate per pregnancy compared with SERMs with or without adjuncts followed by timed intercourse (high certainty).
Letrozole showed no clear difference in miscarriage rate per pregnancy compared with laparoscopic ovarian drilling (low certainty).
It is very uncertain whether hCG changes miscarriage rate per pregnancy compared with gnRH‐a (very low certainty).
It is very uncertain whether u‐hCG changes miscarriage rate per pregnancy compared with r‐hCG (very low certainty).
Progesterone showed no clear difference in miscarriage per clinical pregnancy compared with no treatment or placebo (route of progesterone administration) (low certainty).
It is very uncertain whether the intervention changes miscarriage per clinical pregnancy (very low certainty).
It is very uncertain whether magnetic‐activated cell sorting (MACS) changes miscarriage per clinical pregnancy compared with ICSI (very low certainty).
It is very uncertain whether zeta sperm selection changes miscarriage per clinical pregnancy compared with ICSI (very low certainty).
It is very uncertain whether magnetic‐activated cell sorting (MACS) changes miscarriage per clinical pregnancy compared with hyaluronic acid‐selected sperm (HA‐ICSI) (very low certainty).
Hyaluronic acid‐selected sperm (HA‐ICSI) may leads to lower miscarriage per clinical pregnancy compared with ICSI (low certainty).
It is very uncertain whether hyaluronic acid‐selected sperm (HA‐ICSI) changes miscarriage per clinical pregnancy compared with viscous medium containing HA (SpermSlow) (very low certainty).
Progesterone showed no clear difference in miscarriage rate per clinical pregnancy compared with placebo/no treatment (low certainty).
Progesterone showed no clear difference in miscarriage rate per clinical pregnancy compared with placebo/no treatment (low certainty).