The annual variability in levels of flavonoids, total phenolics,
and ascorbic acid in the tomatoes compared in this study point
to the importance of making multiple-year comparisons to
establish the role of exogenous factors such as environment as
well as the normal variation within a cultivar. The data are
presented on a DWB for analytical comparisons and on a FWB
for nutritional comparisons. For example, levels of kaempferol
on average are 6% higher in organic Burbanks and 8% higher
in organic Ropreco tomatoes on a DWB, whereas levels are
17% higher in organic Burbanks and 19% higher in organic
Ropreco tomatoes on a FWB. These differences (FWB) show
that on average a 40 g organic tomato would provide as much
kaempferol as a 47 g conventional one of the same variety.