Strengths and limitations
Strengths of our study include its large sample size, incorporation of
women of all age ranges, and representation of patients from the full
spectrum of IVF protocols. Another advantage of this study was that it
included only single-center cycles, which minimized potential bias
(e.g., laboratory conditions and the protocol of IVF). In addition, we
adjusted more variables to make the result more reliable.
There are some limitations to this study, such as its retrospective
nature, which reduces its direct application to clinical practice.
Interpretation of the results must take into account the fact that the
study was restricted to patients who underwent IVF with at least a basic
level of income and equal access to health facilities.