Table 1

Basic characteristics of included subjects according to quintiles of serum Mg (n=962)

Quintiles of serum MgP values
Q1 (lowest)Q2Q3Q4Q5 (highest)
Median Mg concentration (mmol/L)0.820.870.910.940.99
Participants (n)200215190168189
Age (years)53.8 (7.3)54.6 (7.6)55.2 (7.9)55.3 (7.1)56.1 (8.0)0.062
BMI (kg/m2)25.2 (3.2)24.9 (3.2)25.0 (3.7)25.2 (3.4)24.6 (3.2)0.464
Female (%)37.542.336.842.337.00.627
Smoking (%)27.527.421.624.421.70.457
Alcohol drinking (%)34.536.340.541.138.10.645
High school diploma (%)45.047.445.356.548.10.184
Activity level (hour/week)2.0 (3.5)2.0 (3.3)2.3 (3.5)2.1 (3.1)2.4 (3.5)0.457
Fasting glucose (mmol/L)6.6 (3.0)5.7 (1.7)5.7 (1.4)5.5 (0.9)5.5 (1.6)0.009
Systolic pressure (mm Hg)129.2 (16.9)128.3 (17.9)130.4 (16.2)128.8 (16.3)129.6 (17.7)0.837
Diastolic pressure (mm Hg)81.2 (11.8)79.8 (12.1)80.7 (11.0)80.7 (10.7)80.3 (10.5)0.654
HDL cholesterol (mmol/L)1.5 (0.4)1.5 (0.4)1.5 (0.4)1.5 (0.3)1.5 (0.4)0.374
Triglyceride (mmol/L)2.1 (1.9)1.8 (1.5)2.0 (2.1)1.8 (1.0)2.3 (2.9)0.620
Uric acid (μmol/L)337.3 (101.7)329.0 (80.7)321.3 (86.3)331.5 (78.0)329.4 (81.7)0.590
eGFR (mL/min/1.73 m2)80.2 (14.4)77.7 (10.7)76.0 (10.6)75.8 (10.7)74.3 (12.0)<0.001
MetS (%)26.517.725.819.617.50.059
DM (%)23.510.710.08.36.3<0.001
HP (%)40.033.537.442.340.20.432
HU (%)25.519.113.218.514.80.018
  • Data are mean (SD), unless otherwise indicated. P values are for test of difference across all quintiles of serum Mg.

  • BMI, Body Mass Index; DM, diabetes mellitus; eGFR, estimated glomerular filtration rate; HDL, high-density lipoprotein; HP, hypertension; HU, hyperuricaemia; MetS, metabolic syndrome; Mg, magnesium.