Table 2.

Summary of meta-analysis outcomes

Outcome	No. of studies	No. of participants	Type of meta-analysis	Effect estimate (95% CI)	P value	I2 (%)	Egger's test (P value)
Total Testosterone	3	179	WMD (fixed)	-0.14,0.11	0.767	31.8	0.991
SHBG	3	179	WMD (fixed)	0.32,19.18	0.043	0.0	0.075
HOMA-IR	3	189	WMD (random)	-1.12,0.37	0.326	53.3	0.687
BMI	5	270	WMD (fixed)	-1.32,0.31	0.227	0.0	0.182
Weight	4	206	WMD (fixed)	-3.25,1.54	0.485	0.0	0.588
NO	2	124	WMD (random)	-8.78,5.31	0.630	69.9	\
TAC	2	124	WMD (fixed)	65.24,147.18	≤ 0.001	0.0	\
GSH	2	124	WMD (random)	-39.30,91.68	0.433	64.1	\
MDA	2	124	WMD (random)	-1.16,0.43	0.373	54.3	\
LDL	2	136	SMD (fixed)	-0.49,0.18	0.359	0.0	\
HDL	2	136	SMD (fixed)	-0.48,0.19	0.405	0.0	\
Triglycerides	2	136	SMD (random)	-0.84,0.62	0.769	78.6	\
FPG	2	123	SMD (random)	-1.38,0.90	0.678	89.7	\

Values are mean ± SD; (s): selenium group (c): control group;