Table 1.

Inflammatory markers and depressive symptom domains by age (Quartiles).

Quartile	1	2	3	4
Age (years)	25–43	44–53	54–63	64–84
n	515	522	509	531
Inflammation
CRP (M ± SD)	1.83 (2.20)	1.88 (2.07)	1.92 (2.13)	1.84 (1.98)
IL-6 (M ± SD)	1.89 (1.82)	2.07 (2.01)	2.61 (2.45)	3.23 (2.91)
Depressive symptoms
% Clinically elevated	21.0	19.0	13.9	8.7
Depressed affect (M ± SD)	2.30 (3.14)	2.24 (3.20)	1.49 (2.55)	1.16 (2.19)
Anhedonia (M ± SD)	3.71 (3.15)	3.22 (2.98)	3.28 (3.27)	3.39 (3.42)
Somatic complaints (M ± SD)	3.82 (3.35)	3.54 (3.11)	2.98 (3.27)	2.83 (2.61)
Interpersonal problems (M ± SD)	0.58 (0.95)	0.47 (0.87)	0.31 (0.76)	0.25 (0.63)