. Author manuscript; available in PMC: 2017 Nov 1.

Published in final edited form as: Biom J. 2016 Aug 23;58(6):1538–1551. doi: 10.1002/bimj.201500201

Table 1.

Distributions of W, X, and G in Men (N = 200) from the Observing Protein and Energy Nutrition Study, Washington, DC, Metro Area, 1999–2000.

Measure (log scale)	Mean	Variance	Correlation with X	Correlation with W
Absolute protein (log kcal)
Protein, FFQ (W)	5.64	0.156	0.329
Protein, UN (M)	6.04	0.063	0.800	0.263
Protein, truth (X)	6.04	0.040		0.329
rEI/BMR (G)	0.05	0.128	−0.060	0.803
Protein density
% Energy protein, FFQ (W)	2.70	0.042	0.401
% Energy protein, UN (M)	2.69	0.053	0.753	0.302
% Energy protein, truth (X)	2.69	0.030		0.401
rEI/BMR (G)	0.05	0.128	−0.025	−0.089
Other variables^a)
BMI (kg/m², log scale)	3.32	0.023	0.382	−0.004
Height (cm)	176.6	56.3	0.280	0.267
Age (y)	54.3	76.6	−0.054	−0.086

FFQ, food frequency questionnaire; UN, urinary nitrogen; rEI, reported energy intake from FFQ; BMR, basal metabolic rate.

^a)

Correlation with W for other variables is with absolute protein.