Table 3. Subgroup analyses of BMI and body weight stratified by pre-defined study characteristics.

	BMI				Body weight
Study characteristics	Number of subjects	Net change (95% CI)	Test of heterogeneity		Number of subjects	Net change (95% CI)	Test of heterogeneity
			I2 (%)	P-value			I2 (%)	P-value
Co-intervention plus five MetS risk factors
Yes	98	−1.60 (−2.05, −1.14)	NA	1.0000	98	−4.14 (−4.85, −3.43)	NA	1.0000
No	204	−0.40 (−0.69, −0.12)	0	0.7932	150	−0.35 (−0.68, −0.02)	0	0.6478
Concomitant management plan
Yes	98	−1.60 (−2.05, −1.14)	NA	1.0000	98	−4.14 (−4.85, −3.43)	NA	1.0000
No	204	−0.40 (−0.69, −0.12)	0	0.7932	150	−0.35 (−0.68, −0.02)	0	0.6478
Type of tea or tea extract
Puerh tea	159	−0.35 (−0.67, −0.03)	0	0.9568	70	−0.34 (−0.82, 0.13)	NA	1.0000
Green tea	143	−1.11 (−2.10, −0.12)	85.5	0.0086	178	−1.59 (−4.00, 0.82)	97.4	<0.0001
Study country
Asian	159	−0.35 (−0.67, −0.03)	0	0.9568	70	−0.34 (−0.82, 0.13)	NA	1.0000
Non-Asian	143	−1.11 (−2.10, −0.12)	85.5	0.0086	178	−1.59 (−4.00, 0.82)	97.4	<0.0001
MetS diagnostic criteria
IDF	213	−0.85 (−1.66, −0.04)	87	0.0005	213	−1.66 (−3.84, 0.52)	97.6	<0.0001
Other	89	−0.36 (−0.80, 0.08)	NA	1.0000	35	−0.10 (−0.80, 0.60)	NA	1.0000
Study treatment duration
2–3 months	204	−0.40 (−0.69, −0.12)	0	0.7932	150	−0.35 (−0.68, −0.02)	0	0.6478
6 months	98	−1.60 (−2.05, −1.14)	NA	1.0000	98	−4.14 (−4.85, −3.43)	NA	1.0000
Jadad score
Low (<4)	143	−1.11 (−2.10, −0.12)	85.5	0.0086	178	−1.59 (−4.00, 0.82)	97.4	<0.0001
High(≥4)	159	−0.35 (−0.67, −0.03)	0	0.9568	70	−0.34 (−0.82, 0.13)	NA	1.0000

Abbreviations: BMI, body mass index; CI, confidence interval; IDF, International Diabetes Federation; MetS, metabolic syndrome; NA, not available.