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Fig. 2 KaplanMeier 10-yr survival analysis of the influence of haematocrit ( : <35%; : 3539%; : 4044%; : 4549%; : 5054%; : 55%) calculated by the actuarial method in a cohort of 2,524 chronic obstructive pulmonary disease patients with arterial oxygen tension below 7.3 kPa (55 mmHg) being prescribed long-term oxygen therapy. Modified from [13] with permission from the publisher.
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