TABLE 3.

Comparison of vitamin A total body stores and estimated liver concentrations using individual and population retinol ¹³C-natural abundance in children and women from 6 African countries

	TBS-study1	TBS-global1	TLR-study	TLR-global	TLR-study	TLR-global
	(μmol)		50% of TBS in liver (μmol/g)		80% of TBS in liver (μmol/g)
Children
Mean bias	−17	14	−0.018	0.011	−0.029	0.017
95% LoA	(−318, 283)	(−370, 398)	(−0.343, 0.306)	(−0.390, 0.411)	(−0.549, 0.490)	(−0.623, 0.657)
Mean bias % of reference mean2	−1.7	2.2	−0.7	1.4	−1.1	2.2
95% LoA	(−23, 20)	(−32, 37)	(−15, 13)	(−20, 23)	(−23, 21)	(−32, 37)
n	570		568		568
Women
Mean bias	−31	−25	−0.010	−0.008	−0.016	−0.012
95% LoA	(−202, 139)	(−180, 130)	(−0.063, 0.043)	(−0.056, 0.041)	(−0.100, 0.069)	(−0.090, 0.066)
Mean bias % of reference mean2	−3.7	−2.5	−2.3	−1.6	−3.7	−2.5
95% LoA	(−21, 14)	(−20, 14)	(−13, 9)	(−12, 9)	(−21, 14)	(−20, 14)
n	136		136		136

LoA, limits of agreement; TBS, total body vitamin A store; TLR, total liver vitamin A reserve.

¹Study and global refer to TBS or TLR outcomes calculated using study and global population-level retinol ¹³C-natural abundance values, respectively.

²Mean bias, mean bias % of individual reference, and 95% limits of agreement were determined relative to vitamin A outcomes calculated using individual retinol ¹³C-natural abundance values within children or women subgroups.