Skip to main content

Table 6 Protein, regression of log(biomarker) on log(self-report) and other predictors in NPAAS (n = 450) and R 2

From: Factors relating to eating style, social desirability, body image and eating meals at home increase the precision of calibration equations correcting self-report measures of diet using recovery biomarkers: findings from the Women’s Health Initiative

 

Food frequency questionnaire (FFQ)

4 day food record

24 Hr diet recall

Variable

β

SE

R2

β

SE

R2

β

SE

R2

Intercept

4.252*

0.055

 

4.206*

0.051

 

4.250*

0.052

 

Log(Protein-FFQ-C)

0.132*

0.032

9.295

0.462*

0.049

22.141

0.397*

0.050

16.463

BMI-C

0.009*

0.003

5.481

0.009*

0.003

4.823

0.010*

0.003

5.513

Age-C

-0.012*

0.002

4.03

-0.01*

0.002

2.493

-0.012*

0.002

3.530

Race:

  

2.65

  

3.115

  

3.547

Black

-0.127*

0.043

 

-0.138*

0.038

 

-0.152*

0.039

 

Hispanic

-0.122*

0.044

 

-0.10*

0.040

 

-0.106*

0.041

 

Other

-0.029

0.080

 

0.001

0.073

 

-0.033

0.075

 

Meals at Home:

  

0.284

  

0.385

  

0.337

Med

0.027

0.035

 

0.046

0.032

 

0.033

0.033

 

High

0.049

0.036

 

0.049

0.033

 

0.046

0.034

 

Body Image:

  

0.136

  

0.254

  

0.117

Med

0.005

0.042

 

0.006

0.038

 

-0.007

0.039

 

High

0.040

0.068

 

0.062

0.063

 

0.031

0.065

 

TFEQ-R18:

         

Restraint

  

0.06

  

0.077

  

0.048

Med

-0.016

0.033

 

-0.020

0.030

 

-0.011

0.031

 

High

0

0.040

 

0.007

0.037

 

0.023

0.038

 

Unc. Eat.:

  

0.919

  

0.608

  

0.640

Med

-0.065

0.037

 

-0.059

0.034

 

-0.050

0.035

 

High

-0.068

0.043

 

-0.048

0.040

 

-0.055

0.041

 

Emo. Eat.:

  

0.908

  

1.267

  

0.789

Med

0.054

0.037

 

0.062

0.034

 

0.049

0.035

 

High

-0.024

0.050

 

-0.032

0.046

 

-0.023

0.047

 

Social Desirability:

  

0.109

  

0.130

  

0.112

Med

0.017

0.034

 

0.007

0.032

 

0.024

0.032

 

High

0.027

0.037

 

0.029

0.034

 

0.021

0.035

 

Total1

  

23.872

  

35.291

  

31.097

  1. BMI, body mass index.
  2. *β Coefficient differs from zero at p = 0.05 significance level.
  3. 1Total – percent of variation explained by all variables. R2 values for specific variables arise from analyses with only these regression variables, with subsequent rescaling so that these R2 values add to the total regression R2. R2 values for race/ethnicity pertain to comparisons among the four groups (white, black, Hispanic, other minority).
  4. Suffix C (e.g. BMI-C) = Centered values; for psychosocial & meals at home variables: medium and high are compared to low.