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. Author manuscript; available in PMC: 2022 Apr 1.
Published in final edited form as: Clin Respir J. 2020 Dec 2;15(4):389–399. doi: 10.1111/crj.13310

Figure 4:

Figure 4:

Contour Plot: The axes are those used in the allocation rule: Vitamin D levels, mMRC and COPD exacerbations. The colour in the right side bar in the graph indicates Vitamin D levels. All the subjects with 3 or more exacerbations had Vitamin D levels below 15ng/ml.