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Durham University

Institute of Medieval and Early Modern Studies (IMEMS)

Staff and Governance

To contact the IMEMS administrative office please use the following details:

E: admin.imems@durham.ac.uk

T: 0191 334 2974

Core Staff

The day-to-day running of IMEMS is the responsibility of the Core Executive Committee, comprising the Director and Associate Directors and the Administrator. 

Publication details for Dr Andrew R Millard

Redfern, R.C., DeWitte, S.N., Beaumont, J., Millard, A.R. & Hamlin, C. (2019). A new method for investigating the relationship between diet and mortality: hazard analysis using dietary isotopes. Annals of Human Biology

Author(s) from Durham

Abstract

Background: The population of Roman Britain are renowned for having elevated nitrogen (δ15) stable isotope values, which have been interpreted as evidence for the increased consumption of marine products. However, such results are now understood to also reflect episodes of stress and disease, suggesting that new interpretations are warranted.

Aim: To test our novel approach which combines hazard mortality analysis and stable isotope data to determine whether there is a relationship between age-at-death, elevated δ15N values and mortality risk.

Subjects and methods: We used published osteological and dietary stable isotope data for nitrogen (δ15N) and carbon (δ13C) of 659 1st-5th century AD individuals aged >12 years old excavated from Roman cemeteries in Britain. The relationship between diet and mortality risk was assessed using the Gompertz hazard model, and differences in median reported isotope values between the sexes was determined using a Mann Whitney test.

Results: We discovered that higher δ15N are associated with elevated risks of mortality, whereas the opposite pattern was observed for δ13C, and males had higher median δ13C and δ15N values.

Conclusion: We successfully demonstrated that stable isotope data can be integrated in to hazard models, allowing us to connect diet and mortality in past populations. It supports the findings of other isotope studies, which have established that individuals with childhood stress/trauma will have different isotope patterns.


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