Conclusion
In this large register-based study we observed an increased risk of
OASIS associated with primiparity, instrumental delivery, increasing
maternal age, previous CS and low maternal height. Obesity was observed
to slightly increase the risk of OASIS if adjustments for birth weight
were not made, which might be the most clinically appropriate adjustment
model to use in this case. A negative association with OASIS was seen
with smoking and low maternal educational levels, however there are
uncertainties whether this association represents a true protective
effect or a potential difference in the provision of health care. Future
studies will be able to use these results in a clinical setting aimed at
individual risk assessment improving women’s health.
Acknowledgements : None
Disclosure of interest : None to declare
Contributions of authorship : KA, AS and KK contributed to the
overall design of the study and the analysis and interpretation of the
data. KA drafted the first manuscript. AS and KK then revised and
critically appraised the draft before all authors approved of the final
manuscript.
Details of ethics approval : The study was approved by the
Regional Medical Ethics Committee, Lund, Sweden (2018/538).
Funding : None to declare