2.3.2. Quality assessment
Four
reviewers (YJ.G, YX.Y, ML, HB. Y) independently extracted the following
features of the literatures listed in study characteristics: first
author, published time, study date, the number and age of patients and
the number of severe case or death, fever, cough, lymphopenia,
positive CT findings, coexisting disorders, preterm labor, cesarean
section, fetal distress, neonatal asphyxia or neonatal death or
stillbirth, neonatal infection, virus in breast milk. They also
evaluated the quality of the literature using the Institute of Health
Economics (IHE) case series methodological quality evaluation
tool(8), which is evaluated in 8 areas: (1) Research
purpose, (2) Research population, (3) Intervention and joint
intervention, (4) Outcome measures, (5) Statistical analysis, (6)
Results and conclusions, (7) Conflict of interest and funding sources,
(8) New entry. There is a total of 20 items above, satisfying 14 (70%)
or more is considered acceptable quality.