Table 2 Characteristics of the study populations (NHANES 1999–2006).

From: Development and validation of a prediction equation for body fat percentage from measured BMI: a supervised machine learning approach

Variables

NHANES 1999–2002

(n = 5931)

NHANES 2003–2006

(n = 2340)

Mean (%)

SEc

Mean (%)

SE

Age(year)

43.46

0.18

43.52

0.29

BMI(kg/m2)

28.54

0.08

28.23

0.12

Body fat percentage

33.83

0.12

35.01

0.21

LDL (mg/dL)

122.95

0.69

117.14

0.74

Gender

 Male

2991 (50)

 

1229 (53)

 

 Female

2940 (50)

 

1111 (47)

 

Races

 Hispanic

1888 (32)

 

614 (26)

 

 White

2791 (47)

 

1188 (51)

 

 Black

1252 (21)

 

538 (23)

 

Incomea

 High

4865 (82)

 

1963 (84)

 

 Low

1066 (18)

 

377 (16)

 

Educationb

 High

4070 (69)

 

1751 (75)

 

 Low

1861 (31)

 

589 (25)

 
  1. aIncome: High means at or above poverty line, low means below poverty line.
  2. bEducation: High means education is equal to or above high school level, low means education is less than high school level.
  3. cSE: Standard error of mean.
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