Table 1.
Characteristic of included studies in meta-analysis.
| Author | Publication Year | Country | Study Design | Participant | Sex | Trial Duration (Week) |
Means Age | Means BMI | Intervention | Sample Size | |||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| IG | CG | IG | CG | Treatment Group | Green Tea Dose (mg) | Control Group | IG | CG | |||||||
| Azizbeigi et al. 2009 | 2009 | Iran | RCT | Obese men | M | 8 | 23.9 | 22.8 | 31.8 | 30.8 | Green tea extract | 500 mg | 500 mg sucrose | 10 | 10 |
| Jowko et al. 2011 | 2011 | Poland | DB/R/PC | Healthy individuals | M | 4 | 21.5 | 21.2 | 23.85 | 23.31 | Green tea extract | 640 mg of polyphenols | Maltodextrin | 17 | 18 |
| Bogdanski et al. 2012 | 2012 | Poland | DB/R/PC | Obese, hypertensive patients | F/M | 12 | 49.2 | 51.5 | 32.5 | 33.9 | Green tea extract | 379 mg | Pure microcrystalline cellulose | 28 | 28 |
| Suliburska et al. 2012 | 2012 | Poland | DB/R/PC | Obese patients | F/M | 12 | 48.56 | 52.26 | 32.07 | 33.45 | Green tea extract | 379 mg | Pure microcrystalline cellulose | 23 | 23 |
| Mousavi et al. 2013 (A) | 2013 | Iran | RCT | T2DM patients | F/M | 8 | 54.6 | 52 | 27.4 | 28.1 | Green tea | 4 cup = 10,000 mg | - | 26 | 14 |
| Mousavi et al. 2013 (B) | 2013 | Iran | RCT | T2DM patients | F/M | 8 | 56.2 | 52 | 28.1 | 28.1 | Green tea | 2 cup = 5000 mg | - | 25 | 14 |
| Lasaite et al. 2014 (A) | 2014 | Lithuania | DB/R/PC | T2DM patients | F/M | 36 | 57.2 | 56.8 | NR | NR | Green tea extract | 400 | Microcrystalline cellulose | 17 | 14 |
| Lasaite et al. 2014 (B) | 2014 | Lithuania | DB/R/PC | T2DM patients | F/M | 36 | 57.2 | 56.8 | NR | NR | Green tea extract | 600 | Microcrystalline cellulose | 17 | 14 |
| Spadiene et al. 2014 (A) | 2014 | Lithuania | DB/R/PC | T2DM patients | nr | 36 | 62.18 | 62.18 | 35.23 | 34.98 | Green tea extract | 400 | Microcrystalline cellulose | 20 | 25 |
| Spadiene et al. 2014 (B) | 2014 | Lithuania | DB/R/PC | T2DM patients | nr | 36 | 62.18 | 62.18 | 35.23 | 34.98 | Green tea extract | 600 | Microcrystalline cellulose | 20 | 25 |
| Mozaffari-Khosravi et al. 2014 | 2014 | Iran | RCT | Type 2 Diabetes Mellitus | F/M | 4 | 52.2 | 52.1 | 28 | 28.3 | Green tea | 450 mL | Sour tea | 48 | 46 |
| Kuo et al. 2015 | 2015 | Taiwan | DB/PC | Healthy individuals | M | 4 | 20 | 20 | 21.95 | 23.55 | Green tea extract | 250 mg | Starch capsule | 10 | 10 |
| Hadi et al. 2016 | 2016 | Iran | DB/R/PC | Soccer players | M | 3 | 22.6 | 22.82 | Green tea extract | 450 mg | 450 mg of maltodextrin | 18 | 18 | ||
| Soeizi et al. 2017 | 2017 | Iran | SB/R/PC | β–Thalassemia Major | F/M | 8 | 23.1 | 24.2 | 20.9 | 19.42 | Green tea | 2500 mg | Warm water | 26 | 26 |
| Ribeiro Vaz et al. 2018 | 2018 | Brazil | DB/R/PC | type 1 DM or type 2 DM | F/M | 20 | 46.48 | 52.29 | 27.58 | 25.6 | Green tea extract | 1120 mg | cellulose capsules | 27 | 28 |
| Venkatakrishnan et al. 2018 | 2018 | Taiwan | DB/R/PC | Hypercholesterolemic subjects | F | 12 | 45 | 45 | 31.39 | 28.81 | Green tea | 600 mL (780.6 mg of catechin) | Tea flavor with very less concentration of catechin and caffeine | 20 | 20 |
| Sadowska-Krepa et al. 2019 | 2019 | Poland | RCT | Male students of the physical education | M | 6 | 22 | 23.1 | 23.73 | 24.72 | Green tea extract | 250 mg | Microcrystalline cellulose, magnesium stearate and maltodextrin |
8 | 8 |
| Sobhani et al. 2020 | 2020 | Iran | RCT | Healthy individuals | M | 2 | 26.12 | 24 | 23.85 | 24.62 | Green tea extract | 640 mg of polyphenols | Maltodextrin | 8 | 7 |
| Bazyar et al. 2020 | 2020 | Iran | RCT | T2DM patients | F/M | 8 | 51.75 | 52.61 | 29.46 | 29.28 | Green tea extract | 600 mg of EGCG | 600 mg of wheat flour | 22 | 22 |
Abbreviations: IG, intervention group; CG, control group; DB, double-blinded; SB, single-blinded; PC, placebo-controlled; CO, controlled; R, randomized; NR, not reported; F, female; M, male; RCT, randomized clinical trial.