. 2020 Oct 19;224(4):382.e1–382.e18. doi: 10.1016/j.ajog.2020.10.020

Table 9.

Pathologist interobserver reliability for select placental histopathology findings in a subset of placentas from COVID-19 cases (n=26) and controls (n=21)

Placental lesion	AC₁ (SE)
FVM with avascular villi, low grade	0.961 (0.028)
FVM with avascular villi, high grade	0.929 (0.038)
FVM with mural fibrin deposition	1.000 (0)
VUE, low grade	0.954 (0.027)
VUE, high grade	0.941 (0.036)

AC1, Gwet’s first-order agreement coefficient; COVID-19, coronavirus disease 2019; FVM, fetal vascular malperfusion; SE, standard error; VUE, villitis of unknown etiology.

Patberg et al. Coronavirus disease 2019 placental pathology. Am J Obstet Gynecol 2021.