Fig. 2

A scatterplot visualising the association between HRV and worry (a), anxiety (b), stress (c), and depression (d) symptom severity. A line of best fit with 95 % confidence region was overlaid on the scatterplots to illustrate data trends. DASS A = DASS anxiety score; DASS S = DASS stress score, DASS D = DASS depression score; PSWQ = Penn State worry questionnaire score