American Diabetes Association

Table 2

Subgroup analyses relating magnesium to type 2 diabetes by characteristics of study designs and populations

Group	Number of studies	RR (95% CI)	P	P_{heterogeneity}	I² (%)	P_interaction
Total	13	0.78 (0.73–0.84)	<0.001	0.04	42.4
Geographic area						0.64
U.S.	8	0.77 (0.71–0.83)	<0.001	0.04	49.9
Asia	3	0.81 (0.71–0.91)	0.001	0.53	0
Duration (years)						0.93
≤6	7	0.79 (0.73–0.85)	<0.001	0.05	48.9
>6	6	0.78 (0.75–0.82)	<0.001	0.12	40.2
Sex						0.95
Men	5	0.77 (0.73–0.81)	<0.001	0.85	0
Women	9	0.76 (0.70–0.83)	<0.001	0.06	47.1
Family history of diabetes						0.83
Yes	4	0.73 (0.62–0.85)	<0.001	0.42	0
No	4	0.71 (0.62–0.80)	<0.001	0.31	15.7
BMI (kg/m²)						0.13
<25	3	1.09 (0.76–1.56)	0.76	0.12	52.9
≥25	6	0.73 (0.66–0.81)	<0.001	0.21	28.1

Group	Number of studies	RR (95% CI)	P	P_{heterogeneity}	I² (%)	P_interaction
Total	13	0.78 (0.73–0.84)	<0.001	0.04	42.4
Geographic area						0.64
U.S.	8	0.77 (0.71–0.83)	<0.001	0.04	49.9
Asia	3	0.81 (0.71–0.91)	0.001	0.53	0
Duration (years)						0.93
≤6	7	0.79 (0.73–0.85)	<0.001	0.05	48.9
>6	6	0.78 (0.75–0.82)	<0.001	0.12	40.2
Sex						0.95
Men	5	0.77 (0.73–0.81)	<0.001	0.85	0
Women	9	0.76 (0.70–0.83)	<0.001	0.06	47.1
Family history of diabetes						0.83
Yes	4	0.73 (0.62–0.85)	<0.001	0.42	0
No	4	0.71 (0.62–0.80)	<0.001	0.31	15.7
BMI (kg/m²)						0.13
<25	3	1.09 (0.76–1.56)	0.76	0.12	52.9
≥25	6	0.73 (0.66–0.81)	<0.001	0.21	28.1