PGF and COVID-19: Pooled analysis of the sFlt-1/PlGF ratio in COVID-19 patients with and without hypertensive disease of pregnancy varied and amounted to 187.0 ± 121.8 vs. 21.6 ± 8.6, respectively (SMD = 2.46; 95% CI: 0.99 to 3.93; p = 0.001).