Spearman rank correlation coefficients for comparisons between and among Beck Depression Inventory II scores and blood biomarker measures.

Values in the cells for each comparison are (from top to bottom): the Spearman rank correlation coefficient (Spearman ρ) and number of observations. Pairwise case deletion was used for missing observations. Abbreviations: ACE = angiotensin-converting enzyme. BDI-II = Beck Depression Inventory II. CABG = coronary artery bypass grafting. COPD = chronic obstructive pulmonary disease. hs-CRP = high-sensitivity C-reactive protein. NYHA = New York Heart Association. S-100B = S-100 calcium-binding protein B.
*P<0.05; **P<0.01; ***P<0.001.
†Acute Δ refers to the primary outcome, acute change in depressive symptom severity, defined as the intra-subject difference between BDI-II scores at baseline and discharge.
‡Delayed Δ refers to the secondary outcome, delayed change in depressive symptom severity, defined as the intra-subject difference between BDI-II scores at baseline and six-month follow-up.
§Total Δ refers to the intra-subject difference in blood biomarker levels between baseline and 2 days postoperative.
Spearman rank correlation coefficients for comparisons between and among Beck Depression Inventory II scores and blood biomarker measures.