4. Discussion
In general, the levels of TFA in the sampled product categories
on the Swedish market decreased during the years from 1995–97
to 2007. Mean TFA level in products/product categories analysed,
in the Swedish TRANSFAIR study of 1995–7, was 14.3%, compared
to 5.9% and 0.7% in products analysed in 2001 and 2007, respectively.
In the TRANSFAIR study, products of the same category/type
were, in such cases, merged into one aggregated analytical sample,
representing 2–5 different brands, mixed according to market
shares, where available. In the present study, samples of the same
product type were analysed separately. In 1995–97 TFA levels
higher than 2% of total FA were detected in 20 of 21 products
(aggregates), compared to 3 of 41 products in 2007.