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Table 1 The main characteristic of included observational studies

From: Circulating levels of adropin and diabetes: a systematic review and meta-analysis of observational studies

First Author

(Publication year)

Country/ Study design

Sex/ Sample size

Comorbid chronic disease

Method of measurement

Diagnostic criteria for T2DM/ Diabetes-related complications

Confounders

Adropin levels

(Mean ± SD) ng/mL

Cases

Controls

Addai et al.

(2018) [96]

Iraq/ CC

F / 30

PCOS

ELISA

HOMA - IR > 2.7/ None

Not adjusted

0.14 ± 0.01

0.14 ± 0.01

Aydın et al. (2022) [99]

Turkey/ CS

B/ 50

None

ELISA

NM/ None

Not adjusted

0.26 ± 0.07

0.64 ± 0.39

Eshaghi et al. (2021) [100]

Iran/ CS

B/ 134

None

ELISA

NM/ None

Not adjusted

3.06 ± 0.46

4.21 ± 0.52

Hosseini et al.

(2016) [27]

Iran/ CC

M / 80

None

ELISA

ADA/ None

WHR, FBG, LDL-C, HOMA-IR, HbA1c

2.5 ± 1.92

1.9 ± 1.46

Hu et al.

(2018) [94]

China/ CS

B / 571

None

ELISA

ADA/ Albuminuria

Sex and age

2.71 ± 0.7

3.7 ± 1.31

Kutlu et al.

(2019) [95]

Turkey/ CC

B / 81

NAFLD

ELISA

HOMA - IR > 2.7/ None

Not adjusted

0.6 ± 0.2

0.77 ± 0.32

Li, B et al.

(2020) [93]

China/ CS

B / 447

None

ELISA

ADA and WHO/ Albuminuria and retinopathy

Sex, age, BMI, duration of diabetes, SBP, DBP, TC, TG, LDL-C, HbA1c, HOMA-IR, CP, NEP and CHIT1

0.16 ± 0.01*

0.16 ± 0.01

Li, N et al.

(2021) [101]

China/ CS

B / 30

NAFLD

ELISA

HOMA - IR > 2.7/ None

Not adjusted

0.51 ± 0.73

4 ± 3.52

Li, S et al.

(2019) [91]

China/ CS

B / 233

None

ELISA

ADA/ Retinopathy

Sex and age

2.5 ± 0.6

3.84 ± 1.48

Palizban et al.

(2019) [92]

Iran/ CC

B / 146

None

ELISA

ADA/ None

Not adjusted

12.32 ± 2.98

9.51 ± 2.73

Shah et al. (2021) [102]

India/ CS

B/ 100

None

ELISA

ADA/ None

Not adjusted

2.12 ± 0.12

3.82 ± 0.4

Shelest et al.

(2018) [97]

Ukraine/ CS

B / 119

Hypertension and Obesity

ELISA

EASD/ Hypertension and obesity

Not adjusted

2.74 ± 0.78

4.9 ± 0.58

Wu et al.

(2014) [24]

China/ CS

B / 392

Suspected coronary artery disease

ELISA

ADA/ Suspected coronary artery disease

Sex, age, BMI

4.8 ± 1.48

5.53 ± 1.62

Zang et al.

(2018) [98]

China/ CS

B / 176

None

ELISA

ADA/ None

Sex, age, BMI, smoking and drinking, SBP, DBP, TC, TG, LDL-C, HDL-C, hs-CRP

4.1 ± 1.88

5.7 ± 3.2

Zhang et al. (2020) [103]

China/ CS

B/ 224

None

ELISA

None/ retinopathy

Not adjusted

0.012 ± 0.011

0.18 ± 0.008

  1. *The combined effect size is presented.
  2. ADA, American Diabetes Association; B, Both; BMI, Body mass index; CC, Case-control study; CHIT1, Chitotriosidase; CP, Copeptin; CS, Cross- sectional study; DBP, Diastolic blood pressure; EASD, European Association for the Study of Diabetes; F, Female; FBG, Fasting blood glucose; HbA1c, Glycosylated hemoglobin A1c; HDL-C, High density lipoprotein cholesterol; HbA1c, Glycosylated hemoglobin A1c; hs-CRP, High sensitivity c-reactive protein; LDL-C, Low density lipoprotein cholesterol; M, Male; NAFLD, Nonalcoholic fatty liver disease; NEP, neprilysin; NM, Not mentioned; PCOS, Poly cystic ovarian syndrome; SBP, Systolic blood pressure; SD, Standard deviation; T2DM, Type 2 diabetes mellitus; TC, Total cholesterol; TG, Triglyceride; WHO, World Health Organization.