Table 1 Characteristics of the Studies Comparing Peripheral Cytokine Levels Between Elderly with and without Depression Included in the Meta-analysis.

From: IL-1β, IL-6, TNF- α and CRP in Elderly Patients with Depression or Alzheimer’s disease: Systematic Review and Meta-Analysis

Author, year

Country

Peripheral pro-Inflammatory markers

Criteria for Depression

Sample size (N) (Depression/Controls)

Proportion of female gender (%) (Dementia/Controls)

Mean age (years) (Dementia/Controls)

Newcastle-Ottawa Scale Score (Maximum score = 9)

Forti, 2010 64

Italy

IL-6, TNF-a, CRP

DSM-IV and ≥10 on GDS

93/870

74.2/52.9

81.4/ 73.8

7

Diniz, 2010 54

Brazil

IL-1b

MDD on SCID

23/44

82.6/86.4

70.2 /69.5

5

Thomas, 200556

UK

IL-1b, CRP

DSM-IV and ≥20 on Montgomery-Asberg DRS

19/21

68.4/57.1

76.4 /74.9

6

Torres, 201457

Brazil

IL-1b, IL-6

DSM-IV, GDS, MINI-plus

13/18

61.5/50.0

74/ 83

5

Dimopoulos, 200762

Greece

IL-6

DSM-IV and ≥10 on GDS

33/33

60.6 /60.6

65.8 / 65.4

7

Milaneschi, 200855

Italy

IL-1b, IL-6, TNF-a, CRP

≥20 CES-D

213/778

75.1/ 50.6

77.5 / 74.3

7

Elderkin-Thompson, 201263

US

IL-6, CRP

MDD on SCID and 15/17 on Hamilton DRS

42/45

66.7/75.6

69.7 / 69.2

5

Vogelzangs, 201467

Netherlands

IL-6, CRP

DSM-IV and CIDI

358/131

66.2 / 61.1

70.6/ 70.1

6

Charlton, 201853

US

IL-1b, IL-6, TNF-a

MDD on SCID and 15/17 on Hamilton DRS

24/34

66.7/ 61.7

67.2/ 70.2

6

Pennix, 200366

US

IL-6, TNF-a, CRP

≥16 CES-D

145/2879

61.4 /51.0

74.0 /73.6

6

Nadrowski, 201665

Poland

IL-6, CRP

>6 on GDS

1095/2423

Data not provided

Data not provided

7

Marinho, 201273

Brazil

TNF-a

≥6 on GDS

3/50

Data not provided

Data not provided

6

Bremmer, 200877

Netherlands

CRP

≥16 CES-D

38/1094

47.3/73.7

75.2/75.9

6

Kop, 200278

United States

CRP

>10 CES-D

510/3750

Data not provided

Data not provided

6