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

Table 8 All dietary self-reports: a) energy b) protein c) protein density, regression of log(biomarker) on log(self-report) and other predictors in NPAAS (n = 450) and R ²

Variable	β	SE	R²	β	SE	R²	β	SE	R²
Intercept	7.614*	0.028		4.203*	0.051		2.649*	0.056
Log(E/P/PD FFQ-C)	0.018	0.019	3.920	0.009	0.032	9.557	0.049	0.084	5.918
Log(E/P/PD 4DFR-C)	0.156*	0.038	5.896	0.353*	0.061	14.545	0.393*	0.090	7.066
Log(E/P/PD 24Hr-C)	-0.006	0.034	0.204	0.189*	0.060	1.551	0.180*	0.090	0.956
BMI-C	0.013*	0.001	26.722	0.008*	0.003	4.112	-0.004	0.003	0.731
Age-C	-0.009*	0.001	8.130	-0.010*	0.002	2.502	-0.002	0.003	0.019
Race:			1.049			2.421			2.891
Black	-0.019	0.021		-0.132*	0.039		-0.131*	0.041
Hispanic	-0.054*	0.022		-0.085*	0.040		-0.079	0.044
Other	-0.035	0.039		-0.001	0.072		-0.028	0.079
Meals at Home:			0.204			0.298			0.122
Med	-0.018	0.017		0.043	0.032		0.034	0.034
High	-0.003	0.018		0.041	0.033		0.030	0.036
Body Image:			0.271			0.315			0.467
Med	-0.026	0.021		0.003	0.038		0.047	0.042
High	-0.039	0.034		0.067	0.062		0.089	0.069
TFEQ-R18:
Restraint:			0.257			0.051			0.177
Med	0.021	0.016		-0.014	0.030		-0.029	0.032
High	0.030	0.019		0.019	0.037		-0.002	0.040
Unc. Eat:			0.540			0.363			0.365
Med	-0.020	0.018		-0.042	0.034		-0.054	0.037
High.	-0.023	0.021		-0.037	0.039		-0.056	0.043
Emo. Eat:			0.532			1.083			0.520
Med	0.014	0.018		0.054	0.033		0.052	0.037
High	-0.023	0.024		-0.034	0.045		0.015	0.050
Social Desirability:			0.176			0.125			0.503
Med	0.018	0.017		0.014	0.031		-0.031	0.034
High	0.007	0.018		0.029	0.034		0.023	0.036
Total¹			47.902			36.922			19.733

BMI, body mass index.
^*β Coefficient differs from zero at p = 0.05 significance level.
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).
Suffix C (e.g. BMI-C) = Centered values; for psychosocial & meals at home variables: medium and high are compared to low.
Log E/P/PD stands for E = Energy for corresponding a) Energy data; P = Protein for corresponding b) Protein data; PD = Protein Density for corresponding c) Protein Density data.

ISSN: 1475-2891