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Fig. 1 | Respiratory Research

Fig. 1

From: Effect of COPD severity and comorbidities on the result of the PHQ-9 tool for the diagnosis of depression: results from the COSYCONET cohort study

Fig. 1

Distribution of the PHQ-9 sum score stratified according to GOLD grades 1–4 and groups A-D in terms of mean PHQ-9 sum score and standard deviation. To illustrate the variability across patients, standard deviations have been chosen. The figure illustrates the additivity of symptoms and exacerbation risk regarding the sum score, when comparing the changes from A to B and B to D with those from A to C and B to D

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Respiratory Research

ISSN: 1465-993X

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