Table 3.

Subgroup analyses of green tea supplementation on oxidative stress biomarkers.

	NO	WMD (95%CI)	p	P Heterogeneity	I2
Subgroup analyses of green tea supplementation on TAC concentrations.
Overall effect	16	0.20 (0.09, 0.30)	<0.001	<0.001	98.6%
Trial duration (week)
<8	5	0.43 (0.10, 0.75)	0.010	<0.001	99.6%
≥8	11	0.08 (0.02, 0.13)	0.004	<0.001	80.1%
Type of green tea
Green tea extract	12	0.23 (0.03, 0.42)	0.019	<0.001	98.9%
Brewed green tea	4	0.07 (0.03, 0.10)_	<0.001	0.169	40.5%
Sex
Both	8	0.12 (0.08, 0.17)	<0.001	0.173	32.0%
Male	6	0.38 (0.07, 0.69)	0.003	<0.001	99.5%
Female	1	0.05 (0.04, 0.05)	0.015	-	-
Intervention dose (mg/d)
≤400	6	0.06 (−0.01, 0.13)	0.132	<0.001	87.1%
>400	10	0.29 (0.09, 0.49)	0.004	<0.001	99.1%
Health status
Healthy	11	0.08 (0.02, 0.13)	0.004	<0.001	80.1%
Unhealthy	5	0.43 (0.10, 0.75)	0.010	<0.001	99.6%
Baseline BMI (kg/m2)
18.5–24.9	6	0.38 (0.08, 0.68)	0.011	<0.001	99.5%
25–29.9	4	0.11 (0.07, 0.15)	<0.001	0.387	1.1%
≥30	5	0.06 (−0.03, 0.16)	0.176	<0.001	88.2%
Subgroup analyses of green tea supplementation on MDA concentrations
Overall effect	8	−0.00 (−0.00, 0.00)	0.636	<0.001	84.1%
Trial duration (week)
<8	3	−0.08 (−0.21, 0.04)	0.185	0.002	84.2%
≥8	5	−0.00 (−0.00, 0.00)	0.860	<0.001	86.3%
Type of green tea
Green tea extract	4	−0.17 (−0.43, 0.09)	0.202	0.004	77.1%
Brewed green tea	4	−0.00 (−0.00, 0.00)	0.860	<0.001	89.5%
Sex
Both	4	−0.00 (−0.00, 0.00)	0.860	<0.001	89.5%
Male	3	−0.18 (−0.51, 0.15)	0.499	0.002	84.3%
Intervention dose
≤400	2	−0.01 (−0.02, 0.00)	0.215	0.530	0.0%
>400	6	−0.00 (−0.00, 0.00)	0.821	<0.001	88.1%
Health status
Healthy	6	−0.00 (−0.00, 0.00)	0.853	<0.001	82.9%
Unhealthy	2	−0.20 (−0.61, 0.20)	0.331	<0.001	92.1%
BMI
18.5–24.9	3	−0.46 (−0.98, 0.05)	0.081	<0.001	95.0%
25–29.9	3	−0.00 (−0.00, 0.00)	0.493	0.609	0.0%
≥30	2	−0.12 (−0.45, 0.20)	0.451	0.910	0.0%

Abbreviations: CI, confidence interval; WMD, weighted mean differences.