Table 3.

Metaregression analysis of the relationship between outcomes and characteristics of RCTs

Outcome	Substudies (n)	Factor	Coefficient	z	p Value
HbA1c	18	Sample size	0.0004	1.0535	0.2921
		History of diabetes	0.2559	2.0006	0.0454
		Follow-up	−0.0081	−1.5508	0.1210
		Publication year	−0.0079	−0.6481	0.5169
BMI	9	Sample size	0.0034	1.1169	0.2640
		History of diabetes	1.9653	3.4234	0.0006
		Follow-up	−0.0705	−2.3762	0.0175
		Publication year	−0.1805	−1.4780	0.1394
TC	8	Sample size	−0.0001	−0.3244	0.7456
		History of Diabetes	−0.0249	−0.2167	0.8284
		Follow-up	0.0011	0.2634	0.7923
		Publication year	−0.0021	−1.2347	0.2169

BMI, body mass index; HbA1c, glycated haemoglobin; TC, total cholesterol.