On causal inferences from retrospective and observational studies and their implications for neuraxial labor analgesia: the CHRISTMAS* study
Authors' conclusion
Even if this observational study had demonstrated a strong correlation between age at request for reading glasses and arm length, it would have been absurd to conclude that spectacles somehow cause our arms to shrink.
Study context
- Population
- Individuals aged 38–55 receiving their first reading glasses for presbyopia (currently or within the past year)
- Participants
- 70 individuals
- Outcome
- Association between arm length and age when first requesting reading glasses in presbyopia
Methodological detailsretrospective and prospective, observational
- Retrospective and prospective
- Observational
Main finding
As reported in the abstract
Association of arm length with age at request for reading glasses and severity of presbyopia
- No association between arm length and age at request for reading glasses or severity of presbyopia at presentation
Observational data: associations, not effects.
Original publication
On causal inferences from retrospective and observational studies and their implications for neuraxial labor analgesia: the CHRISTMAS* study. Int J Obstet Anesth. Published 10 December 2024. doi:10.
Composed by AI from the published abstract and checked against it. How Briefs are made →