Fig. 2

Linear regression analyses of correlations between anxiety and depression symptoms of (a) angina pectoris, (b) stable angina pectoris, and (c) unstable angina pectoris patients in different NYHA classes. Note: The correlations of depression and anxiety in total angina pectoris patients and unstable angina pectoris patients under different NYHA classes were non-differential. However, stable angina pectoris participants in NYHA III/IV seemed to be less anxious under the same level of depression