Common genetic variants of the ion channel transient receptor potential membrane melastatin 6 and 7 (TRPM6 and TRPM7), magnesium intake, and risk of type 2 diabetes in women

Table 2 Baseline characteristics of patients with type 2 diabetes and control participants.

Characteristics^a	Cases n = 359	Controls n = 359	P value^b
Age, years	60.3 ± 6.1	60.3 ± 6.1	--^c
Race (Caucasian), %	92.5	92.5	--^c
BMI, kg/m²	30.9 ± 6.1	26.0 ± 5.0	<0.0001
Cigarette smoking (%)
Never	47.5	49.6	0.85
Past	38.0	36.8
Current	14.5	13.7
Physical activity, %
Rarely/never	51.1	39.6	0.008
1 to 3 times per month	18.2	21.7
> 1 time per week	30.7	38.7
Alcohol consumption, %
Rarely/never	60.7	47.1	0.0006
1 to 3 times per month	13.7	15.3
>1 time per week	25.6	37.6
Family history of diabetes (%)	48.5	24.0	<0.0001
Dietary factors
Total calorie intake, kcal/d	1809 ± 592	1722 ± 554	0.05
Magnesium intake, mg/d ^d	329 ± 70.5	348 ± 83.0	0.001

^a All data are mean ± SD unless indicated otherwise;
^b P value from chi-square and t tests;
^c Matching variables;
^d Magnesium intake was the total amount of magnesium from both food sources and multivitamin supplements and was energy-adjusted.

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