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Table 1 The characteristics of all participants (N = 6023)

From: Associations of serum vitamins levels with bone mineral density in the different race-ethnicities US adults

Characteristics Mean/Frequency Standard deviation/Percentage (%)
Age (years) 48.62 18.92
Years of school completed (years) 11.12 3.85
Serum folate (nmol/L) 15.67 12.44
Serum vitamin B12 (pmol/L) 358.75 146.83
Serum vitamin C (mmol/L) 41.25 24.65
Serum vitamin A (μmol/L) 1.98 0.57
Serum vitamin E (μmol/L) 26.60 11.39
Body mass index (kg/m2) 27.42 5.66
Bone mineral density of femur neck (g/cm2) 0.83 0.17
Bone mineral density of total region (g/cm2) 0.95 0.18
Sex
 Male 2686 44.60
 Female 3337 55.40
Race
 White 4164 69.13
 Black 1859 30.87
Ethnicity
 Mexican-American 1484 24.64
 Not Hispanic 4539 75.36
Race-ethnicity
 Non-Hispanic white 2687 44.61
 Non-Hispanic black 1852 30.75
 Mexican-American 1484 24.64
Smoking
 No 4479 74.36
 Yes 1544 25.64
Alcohol consumption
 No 5230 86.83
 Yes 793 13.17
Living regionss
 Urban 2825 46.90
 Rural 3198 53.10
Physical activity
 No 3512 58.31
 Yes 2511 41.69
History of fracture
 No 5489 91.13
 Yes 534 8.87
History of hypertension
 No 2490 41.34
 Yes 3533 58.66
History of diabetes
 No 1104 18.33
 Yes 4919 81.67
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