TABLE 5.

The predictive relationship of RBC δ¹³C_alanine for SSB intake, stratified by sex and BMI¹²

Sample	n	β3 (95% CI)	Intercept	R2	P
Total	68	0.23 (0.17, 0.30)	4.43	0.49	<0.0001
Male	35	0.25 (0.15, 0.35)	4.72	0.50	<0.0001
Female	33	0.22 (0.14, 0.31)	4.24	0.51	<0.0001
Normal weight	29	0.22 (0.14, 0.30)	4.26	0.57	<0.0001
Overweight	17	0.30 (0.08, 0.57)	5.20	0.38	0.0087
Obese	21	0.26 (0.09, 0.45)	4.84	0.38	<0.0027
Overweight + obese	38	0.25 (0.13, 0.38)	4.58	0.34	<0.0001

¹Values are n, model parameters, R², and P for linear models in which SSB intake was the dependent variable and δ¹³C_alanine was the independent variable. SSB, sugar-sweetened beverage; δ¹³C_alanine, alanine carbon isotope ratio.

²One underweight participant was excluded from BMI-stratified analyses.

³β-Coefficients are back-transformed for ease of interpretation and are interpreted as proportional increase in SSB intake for every 1‰ increase in δ¹³C_alanine.