A Meta-Analysis for Frequency of Miscarriage in Pregnant Women with COVID-19

Most pregnant women with COVID-19 develop less severe form of the disease, with few cases of severe maternal morbidity and mortality, or perinatal deaths. This meta-analysis was conducted to evaluate the frequency of miscarriage in pregnant women affected by the SARS-COV-2 infection.

A comprehensive search was performed in online databases to identify all relevant studies published up to 5th March 2021. Case-control studies and case series reported the frequency of miscarriage in pregnant women with COVID-19 was selected.

A total of 22 studies with 8591 infected pregnant women and 141 abortions were selected. The frequency of miscarriage was 3.9% (95% CI 0.023-0.063) in infected pregnant women with COVID-19. It had the highest frequency in Asian (6.3%) followed by European (2.9%), West-Asian (2.5%) and Caucasian (2.3%) infected pregnant women. Moreover, stratified analysis by country showed that the frequency of miscarriage is the highest in Chinese (11.3%) followed by Italy (11.2%), India (2.7%), Turkey (2.2%), USA (1.2%) and France (0.9%) infected pregnant women.

Our pooled data revealed that the frequencies of miscarriage in pregnant women with SARS-COV-2 infection were 3.9%.