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Table 3 Serum vitamin D concentrations for all confounding variables of study population: the Third National Health and Nutrition Examination Survey

From: Serum vitamin D concentrations are related to depression in young adult US population: the Third National Health and Nutrition Examination Survey

Characteristic Serum vitamin D1(nmol/L)
Sex  
   Men (n = 3652) 80.5 ± 1.3
   Women (n = 4318) 75.7 ± 1.4
Race-ethnicity  
   Non-Hispanic white (n = 2281) 86.5 ± 1.4
   Non-Hispanic black (n = 2634) 48.5 ± 1.2
   Mexican American/Hispanic (n = 2711) 65.3 ± 1.2
   Other (n = 344) 63.0 ± 1.5
Geographical location  
   Northeast (n = 958) 85.0 ± 2.3
   Midwest (n = 1482) 86.3 ± 3.3
   South (n = 3460) 71.8 ± 1.7
   West (n = 2070) 72.6 ± 1.8
Urbanization  
   Urban living (n = 4135) 72.5 ± 1.3
   Rural living (n = 3795) 83.6 ± 2.0
Supplement use 2  
   Yes (n = 2262) 81.0 ± 1.4
   No (n = 4992) 75.9 ± 1.4
Prescription medicine use 3  
   Yes (n = 1845) 79.3 ± 1.7
   No (n = 5409) 77.2 ± 1.2
Poverty income ratio 4  
   <1.0 (below poverty) (n = 2170) 69.9 ± 1.4
   2.0-<3.0 (low-middle income) (n = 2058) 76.4 ± 1.7
   3.0-<4.0 (high-middle income) (n = 2267) 79.3 ± 1.4
   ≥4.0 (high income) (n = 818) 84.5 ± 2.1
Body mass index (Kg/m2)  
   Underweight (<18.5) (n = 277) 84.7 ± 3.5
   Normal weight (18.5-<25) (n = 3911) 82.4 ± 1.3
   Overweight (25-<30) (n = 2179) 76.3 ± 1.5
   Obese (≥30) (n = 1583) 65.6 ± 1.5
Serum creatinine  
   <70 μmol/L (n = 446) 70.2 ± 3.0
   70-124 μmol/L (n = 7068) 78.6 ± 1.2
   >124 μmol/L (n = 302) 72.2 ± 2.7
  1. 1 Values are means ± standard error of mean
  2. 2 Vitamin/mineral supplement use 1 month prior to the survey
  3. 3 Prescription medicine use 1 month prior to the survey
  4. 4 The ratio of a family's income to their appropriate threshold income