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. Author manuscript; available in PMC: 2017 Feb 1.
Published in final edited form as: Respir Med. 2015 Nov 11;111:30–38. doi: 10.1016/j.rmed.2015.11.004

Fig. 4.

Fig. 4

Distribution of the 10-fold square root expected prediction errors for six-minute walk distance, St. George Respiratory Symptoms Questionnaire Score, SF-36 physical health component score, and the MMRC Dyspnea Scale Score by severity classification criteria for ventilatory impairment stratified by sex. The red horizontal lines represent the root mean squared errors.