| Abbreviation | Representation |
| 2019-nCoV | 2019 Novel Coronavirus |
| 95% CI | 95% Confidence Interval |
| aOR | Adjusted Odds Ratio |
| ACE2 | Angiotensin Converting Enzyme 2 |
| ALT | Alanine Aminotransferase |
| AST | Aspartate Aminotransferase |
| BMI | Body Mass Index |
| COVID-19 | Coronavirus Disease 19 |
| CPAP | Continuous Positive Airway Pressure |
| CRP | C-Reactive Protein |
| ECMO | Extracorporeal Membrane Oxygen |
| Emtree | Embase Subject Headings |
| HELLP | Haemolysis, Elevated Liver enzyme and Low Platelet Syndrome |
| ICU | Intensive Care Unit |
| IFN-gamma | Interferon Gamma |
| IgA | Immunoglobulin A |
| IgG | Immunoglobulin G |
| IgM | Immunoglobulin M |
| IL-6 | Interleukin-6 |
| LMWH | Low Molecular Weight Heparin |
| MERS | Middle East Respiratory Syndrome |
| MERS-CoV | Middle East Respiratory Syndrome Coronavirus |
| MeSH | Medical Subject Headings |
| NICU | Neonatal Intensive Care Unit |
| NOS | Newcastle-Ottawa Scale |
| OR | Odds ratio |
| PECO | Population, Exposure, Comparison/Control, Outcome |
| PlGF | Placental Growth Factor |
| PPROM | Preterm prelabour rupture of membranes |
| PRISMA | Preferred Reporting Items for Systematic Reviews and Meta-Analyses |
| RT-PCR | Real-time polymerase chain reaction |
| RR | Relative risk |
| SARS | Severe Acute Respiratory Syndrome |
| SARS-CoV-1 | Severe Acute Respiratory Syndrome Coronavirus 1 |
| SARS-CoV-2 | Severe Acute Respiratory Syndrome Coronavirus 2 |
| sFLT-1 | Soluble Fms-Like Tyrosine Kinase-1 |
| TNF-alpha | Tumour Necrosis Factor Alpha |
| WHO | World Health Organisation |