Strengths and limitations
There are several strengths in this study. First, the basis for research
selection was explicit search strategies and well-defined research
inclusion criteria. Grey literature was examined, and articles in
different languages were included. Second\soutly, there is currently
no systematic review of studies focusing on the impact of gestational
diabetes on multiple types of children’s allergic diseases. In addition,
this study conducted a subgroup analysis on the types of epidemiological
studies and explored the research effectiveness of different types of
epidemiological studies.
There are also some limitations in our study. All the available evidence
was derived from observational studies (cohort, cross-sectional,
case–control), which have an inherent bias. In addition, not all
studies provided information on preterm/term births, therefore, the
confounder may arise from preterm/term status.