. 2012 Dec 19;143(2):161–165. doi: 10.3945/jn.112.169425

TABLE 2.

Independent effects of foods that have elevated isotope ratios on RBC δ¹³C and δ¹⁵N¹ ²

Stable isotope ratio	Dietary variable	β_s	β (95% CI)	R²
δ¹³C, ‰	Total sugar, g/d	0.36**	0.35 (0.09, 0.61)	0.26
	Fish and marine mammals, % energy	0.46**	1.54 (0.52, 2.57)
	Commercial meats, % energy	0.49**	3.94 (1.80, 6.09)
	Corn products, g/d	0.07	0.03 (−0.08, 0.15)
δ¹⁵N, ‰	Fish and marine mammals, % energy	0.72***	7.24 (5.13, 9.35)	0.50
	Commercial meats, % energy	0.02	0.49 (−4.55, 5.54)

In these models, δ¹⁵N and δ¹³C were the dependent variables and dietary intake measures the independent variables. Significance of association: *** < 0.0001; **P < 0.01.

Both standardized (β_s) and unstandardized (β) β-coefficients are presented.