First author; Country; Year | Selection | Comparability | Outcome | Total | ||||||
Representation of COVID-19 infected pregnant women | Selection of non-COVID-19 exposed pregnant women | Confirmation of COVID-19 infection through nasopharyngeal swab or RT-PCR | Maternal outcomes of interest were not present at the beginning of the study | Adjustments of important risk factors | Adjustments for additional risk factors | Assessment of maternal outcomes | Follow up until end of pregnancy | All patients were followed up adequately |
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Al-Matary et al.; Saudi Arabia; 2021 |
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| 7 |
Angelidou et al.; USA; 2021 |
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| 8 |
Gabriel et al.; Spain; 2020 |
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| 8 |
Gupta et al.; India; 2021 |
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| 7 |
Hcini et al.; France; 2020 |
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| 9 |
Khoury et al.; USA; 2020 |
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| 8 |
Maraschini et al.; Italy; 2020 |
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| 7 |
Norman et al.; Sweden; 2021 |
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| 9 |
Oncel et al.; Turkey; 2021 |
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| 9 |
Saccone et al.; Multinational; 2021 |
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| 9 |
Sánchez-Luna et al.; Spain; 2021 |
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| 7 |
Singh et al.; India; 2021 |
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| 8 |