Table 1

Selected characteristics of the study subjects by sex
Variable Men (n= 4492) Women (n= 6242)
Age (year), mean (SD) 62.3 (6.8) 61.9 (6.7)
Body mass index (kg/m2), mean (SD) 23.5 (2.7) 22.5 (3.1)
Smoking (cigarettes/day), %
 Never 26.1 88.7
 Former 42.4 5.2
 < 20 9.2 3.7
 ≥ 20 23.3 2.4
Alcohol use (mL/day), %
 Never 21.1 70.4
 Former 5.9 2.4
 < 30 29.6 23.5
 30–59 26.2 3.0
 ≥ 60 17.1 0.8
Daily use of coffee, % 57.5 58.0
Serum GGT (IU/L), median (IQR) 35 (24–58) 20 (16–29)
Serum total bilirubin (mg/dL), median (IQR) 0.5 (0.4–0.7) 0.5 (0.4–0.6)
HbA1c (%), median (IQR) 5.0 (4.8–5.3) 5.1 (4.8–5.3)

GGT, gamma-glutamyl transferase; IQR, interquartile range; SD, standard deviation.

Wang et al.

Wang et al. BMC Endocrine Disorders 2012 12:24   doi:10.1186/1472-6823-12-24

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