oxygen enhancement ratio

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ox·y·gen en·hance·ment ra·ti·o

(OER) (ok'si-jĕn en-hans'mĕnt rā'shē-ō)
Ratio of the dose of radiation necessary to produce a given biologic response in the absence of oxygen to the dose required to achieve the same response in the presence of oxygen.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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The oxygen enhancement ratio, a measure of the pathogen's sensitivity to oxygen, was 1.27 and 1.22 for the E.