This document gives the formulae for deriving varous NMR metabolomics ratios and percentages in terms of the UKB Field IDs holding the source data.

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It can be downloaded or viewed using the link: Nightingale_ratio_calculation.tsv

If you have wget available (typically on linux systems), then you can also obtain a copy using the command

 wget  -nd  biobank.ctsu.ox.ac.uk/ukb/ukb/docs/Nightingale_ratio_calculation.tsv