@article{article, title = {{Confounding and Simpson's paradox.}}, url = {{}}, year = {{1994}}, month = {{12}}, author = {{Julious SA and Mullee MA}}, doi = {{10.1136/bmj.309.6967.1480}}, volume = {{309}}, journal = {{BMJ}}, issue = {{6967}}, pages = {{1480-1481}}, note = {{Accessed on 2025/07/15}}}