Table 2. Mean (standard error) observed diet cost, in US$, mean cost of optimized diets^a, mean cost difference and mean deviation d (in g/d) from the observed diets, according to income level (n = 108 GES^b).

	Observed diet cost	Optimized diet cost	Cost differenced	Cost difference (%)e	df
<0.5MWc	1.84 (0.07)	2.59 (0.11)	0.74 (0.08)	40	51.2 (19.9)
0.5–1.5MW	2.03 (0.03)	2.57 (0.09)	0.54 (0.08)	26	36.9 (13.3)
1.5-3MW	2.29 (0.03)	2.52 (0.05)	0.22 (0.03)	10	28.7 (8.3)
>3MW	2.60 (0.02)	2.64 (0.17)	0.04 (0.19)	1.5	41.9 (20.3)
Brazil	2.16 (0.04)	2.58 (0.05)	0.41 (0.05)	20	38.4 (7.91)

^a Lowest cost at the lowest deviation from the observed diet.

^b Geographic-economic strata.

^c Minimum wage.

^d (optimized diet cost–observed diet cost).

^e (optimized diet cost–observed diet cost) / optimized diet cost * 100.

^f Mean of d (acceptability food constraint introduced in the models).