Table 2:

The RR (95% CI) of MetS by Mg quintiles (n=6,802)

	Quintile 1	Quintile 2	Quintile 3	Quintile 4	Quintile 5	a Ptrend
Total Mg, mg/day	<223.50	223.50–291.20	291.30–357.10	357.20–437.90	>437.90
Number of cases	308	291	304	284	283
Number of participants	1360	1361	1361	1362	1358
Model 1	1.00	0.96 (0.83, 1.11)	1.02 (0.89, 1.17)	0.95 (0.83, 1.10)	0.95 (0.83, 1.10)	0.541
Model 2	1.00	0.98 (0.85, 1.13)	1.04 (0.90, 1.20)	0.98 (0.85, 1.14)	1.00 (0.86, 1.16)	0.699
Model 3	1.00	0.88 (0.75, 1.03)	0.90 (0.77, 1.07)	0.83 (0.69, 1.00)	0.79 (0.63, 0.98)	0.043
Sensitivity Analysis	1.00	0.89 (0.76, 1.04)	0.91 (0.77, 1.07)	0.85 (0.71, 1.02)	0.80 (0.64, 1.00)	0.064
Dietary Mg, mg/day	<187.50	187.5–243.00	243.10–298.40	298.50–375.10	>375.10
Number of cases	301	299	310	275	285
Number of participants	1,361	1,360	1,360	1,361	1,360
Model 1	1.00	1.02 (0.88, 1.17)	1.06 (0.92, 1.22)	0.95 (0.82, 1.10)	0.98 (0.85, 1.13)	0.513
Model 2	1.00	1.00 (0.87, 1.16)	1.06 (0.92, 1.22)	0.96 (0.83, 1.12)	1.00 (0.86, 1.16)	0.823
Model 3	1.00	0.90 (0.77, 1.05)	0.89 (0.75, 1.05)	0.76 (0.63, 0.92)	0.72 (0.56, 0.91)	0.006
Sensitivity Analysis	1.00	0.92 (0.79, 1.08)	0.91 (0.77, 1.07)	0.80 (0.66, 0.96)	0.76 (0.60, 0.97)	0.018

Abbreviations: CI, confidence interval; RR, relative risk; total Mg, dietary magnesium plus supplementary magnesium intake; WC, waist circumference

Model 1 was adjusted for age, sex, race, regions and the interaction between age and race

Model 2 was adjusted for covariates in Model 1 plus education, income, smoking, alcohol, and physical activity

Model 3 was adjusted for covariates in Model 2 plus calorie intake, regular aspirin use, calcium intake, and LDL cholesterol For models on dietary Mg intake, supplemental Mg intake was also adjusted.

Sensitivity Analysis: adjusted for covariates in Model 3 plus baseline components of MetS (except baseline WC and glucose as they were not associated with either MetS or Mg in binary analysis).

^aThe median of each quintile was fitted as a continuous variable to compute the P_trend