Table 4. Univariate meta-regression analysis for the potential variables between studies.

Covariates	No. studies	Coefficient	Standard error	t	P	95% CI
BMI	20	-0.794	0.575	-1.38	0.185	[-2.004,0.150]
Duration	20	-0.464	0.541	-0.86	0.402	[-1.600,0.673]
Dose	20	0.205	0.609	0.34	0.741	[-1.074,1.483]
HOMA-IR ratio	20	-0.243	0.171	-1.42	0.172	[-0.601,0.116]
T ratio	20	0.128	0.184	0.70	0.496	[-0.259,0.515]
Quality score	20	0.758	0.546	1.39	0.182	[-0.391,1.908]