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Dr David Robert Grimes, an expert in biostatistics, at Trinity College in Dublin, said more research was needed.

However, the challenge has always been to interpret this vast and detailed dataset, says Xiang Zhou, professor of biostatistics at the University of Michigan School of Public Health and senior author of the study.

As it reads now, the proposed policy lacks clarity, said Thomas Braun, a biostatistics professor.

Later this afternoon we'll hear from two professors at Swansea University – Prof Ann John, who focuses on public health and psychiatry, and Prof Michael Gravenor, who specialises in biostatistics and epidemiology.

It’s important to first think about whether you made the right resolution, said Tyler J. VanderWeele, an epidemiology and biostatistics professor and director of the Human Flourishing Program at Harvard University.