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Fig. 1 | Respiratory Research

Fig. 1

From: Prediction of lung emphysema in COPD by spirometry and clinical symptoms: results from COSYCONET

Fig. 1

Decision tree derived from the inclusion of CAT, SGRQ and mMRC. Only CAT items 1 and 7 as well as SGRQ items 8 and SGRQ 12 sub-item 3 were selected as significant predictors. Item 8 of the SGRQ is the question „How would you describe your chest condition?” with following answer options a) Causes me a lot of problems or is the most important problem I have, b) Causes me a few problems and c) Causes no problem. Please note the large differences in the distribution of diagnoses, whereby the final nodes 4, 5 and 7 were scarcely informative compared to the prior values (comprising 327 patients). In contrast, nodes 3 and 8 were informative (comprising 106 patients). The odds ratio for emphysema corresponding to node 3 was 4.06

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