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Table 1 Study group characteristics and blood Mn levels (μg/L) in participants ages 1 to 80 years; weighted statistics, NHANES 2011-2012 (n=7720)

From: Sex- and age-differences in blood manganese levels in the U.S. general population: national health and nutrition examination survey 2011–2012

Characteristics n Weighted % GM blood Mn (μg/L) AM blood Mn (μg/L) 95% CI
Total 7720 100 9.3 9.9 (9.8, 10.1)
Sex
Male 3857 48.7 8.7 9.2 (9.0, 9.4)
Female 3863 51.3 9.9 10.6 (10.4, 10.8)
Age
<12 years 1761 12.0 10.4 10.9 (10.6, 11.2)
12-80 years 5959 88.0 9.2 9.8 (9.6, 9.9)
Educationa
Less than 9th grade 453 5.6 9.2 10.0 (9.4, 10.5)
9 – 11th grade 648 10.4 9.3 9.9 (9.5, 10.3)
High school grade/GED or equivalent 1027 20.4 8.8 9.3 (9.0, 9.6)
Some college or AA degree 1461 32.1 9.1 9.7 (9.4, 10.0)
College graduate or above 1239 31.5 9.2 9.7 (9.4, 10.1)
Missing 2 -    
PIR
< 0.9 1920 17.1 9.6 10.3 (9.9, 10.6
0.9-1.65 1738 19.0 9.4 10.3 (10.1, 10.5
1.66-3.64 1772 27.3 9.4 9.9 (9.6, 10.2
≥ 3.65 1788 36.6 9.1 9.6 (9.4, 9.8)
Missing 502 -    
Race/ethnicity
Non-Hispanic White 2411 63.6 9.1 9.6 (9.4, 9.8)
Non-Hispanic Black 2162 12.2 8.3 8.9 (8.7, 9.1)
Mexican-American 1058 9.6 10.7 11.3 (11.0, 11.6)
Other Hispanic 820 6.8 10.0 10.5 (9.9, 11.1)
Asian 975 4.8 11.9 12.6 (12.2, 13.0)
Other/multiracial 294 3.0 10.1 10.6 (9.9, 11.3)
BMIb
Underweight 197 2.2 9.3 9.8 (8.9, 10.6)
Normal 3184 37.6 9.4 10.0 (9.8, 10.2)
Overweight 1928 29.7 9.1 9.6 (9.4, 9.8)
Obese 2192 30.5 9.4 10.1 (9.8, 10.3)
Missing 219 -    
Pregnancy statusc
Pregnant women 51 4.7 11.9 12.5 (11.3, 13.8)
Non preg./could not ascertain 1034 95.3 10.2 10.8 (10.5, 11.2)
Menopausal statusd
Premenopausal 1374 56.9 10.1 10.8 (10.5, 11.1)
Postmenopausal 1087 43.1 9.2 9.8 (9.4, 10.2)
  1. AA: Associate degree; GED: General educational development.
  2. afor individuals 20–80 years.
  3. bfor individuals 2–80 years.
  4. cfor women 20–44 years.
  5. dfor women 20–80 years.