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Table 1 Background characteristics of respondents aged 20 years and above, NHANES 2013–2014 (n = 4386)

From: Niacin, lutein and zeaxanthin and physical activity have an impact on Charlson comorbidity index using zero-inflated negative binomial regression model: National Health and Nutrition Examination Survey 2013–2014

 Study Participants
Variablen (%a)
Age
 20–391456 (34.9)
 40–591501 (37.2)
 60 and above1429 (27.9)
Gender
 Male2154 (49.6)
 Female2232 (50.4)
Race/ethnicity
 Hispanic946 (13.8)
 Non-Hispanic White2018 (68.7)
 Non-Hispanic Black863 (10.5)
 Other Races (Including Multi-Racial)559 (7.0)
Educational attainment
 Less than High school842 (13.6)
 GED/AA degree2396 (55.2)
 College and higher1148 (31.2)
Income
 0–24,9991343 (22.5)
 25,000–54,9991275 (27.1)
 55,000–74,999470 (12.0)
 75,000 and above1298 (38.4)
Smoking
 Yes1942 (43.8)
 No2444 (56.2)
Drinking
 Yes3219 (78.6)
 No1167 (21.4)
  1. aAll data are weighted to be nationally representative