The systematic review search process identified 162 relevant articles published, with an
English abstract, in peer-reviewed journals since 1st
January 1958 until 29th
2008. A total of 3558 comparisons of content of nutrients and other substances in
organically and conventionally produced foodstuffs were extracted for analysis.
Details of included studies, livestock products analysed, laboratory methods and units of
measurement, and dot plots of results, are presented by nutrient category in Appendix 13.
Analyses excluded extreme outliers and graphically reported data (listed in Appendix 15).
Summary results of the analysis comparing the content of nutrients and other substances
from organically and conventionally produced livestock products are presented in Table 3
(results presented for all studies and for satisfactory quality studies separately). ...
This gave us the percentage of the nutrients and other substances found in the organically
produced foodstuff above or below that found in the conventionally produced foodstuff,
and enabled us to combine results from different studies for statistical analysis. Positive
differences suggested that there might be more of particular nutrients and other
substances in organically produced foodstuffs, negative differences suggested that there
might be more of particular nutrients and other substances in conventionally produced