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Table 1 Characteristics of study population: the Third National Health and Nutrition Examination Survey¹

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

Characteristic Value
Women 54.2
Non-Hispanic white 28.6
Non-Hispanic black 33.0
Live in South and West regions 70.4
Live in urban areas 51.9
Supplement use 2 28.4
Prescription medicine use 3 23.1
Persons living below poverty 4 27.2
Persons with overweight and obesity 5 47.2
Persons had a major depression 7.9
Persons had depression episodes longer >2 y 11.9
Persons having depression currently 6 4.0
Age (y) 27.5 ± 0.2
Poverty income ratio 7 2.74 ± 0.1
Body mass index (kg/m2) 25.3 ± 0.1
  1. 1 n = 7970. Values are % or 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 Poverty was defined as having poverty income ratio <1.0. Poverty income ratio is the ratio of a family's income to their appropriate threshold income.
  5. 5 Overweight and obesity were defined as having BMI 25 to <30 kg/m2 and ≥30 kg/m2, respectively
  6. 6 Based on the question "Are you in one of these spells of feeling low or disinterested and having some of these other problems now"?
  7. 7 The ratio of a family's income to their appropriate threshold income