Glossary entry (derived from question below)
Portuguese term or phrase:
diferenças mínimas significantes existentes
English translation:
minimal but significant differences
Portuguese term
Brazil
Genuine dedication and professionalism
Native in: Portuguese (Variant: Brazilian) 
Works in: English to Portuguese, Spanish to Portuguese
diferenças mínimas significantes existentes
Aug 10, 2012 20:56: Sheryle Oliver Created KOG entry
PRO (1): Marcelo González
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Proposed translations
minimal but significant differences (that may or may not) exist
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Note added at 7 hrs (2012-07-19 19:30:41 GMT)
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Or to use a more colloquial, Anglo-Saxon term, /slight but significant differences.../
minimum important/significant differences that exist/existing or non-existing minimum important/
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Note added at 28 mins (2012-07-19 12:15:24 GMT)
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apologies
that should be
minimal
not minimum
don't know what happened there!
United States
PhD in Translation Studies
Native in: English (Variant: US)
Works in: Spanish to English, English to Spanish
minute significant differences that exist
Minute | Define Minute at Dictionary.com
http://dictionary.reference.com/browse/minute
extremely small, as in size, amount, extent, or degree: minute differences. 2. of minor importance; insignificant; trifling. 3. attentive to or concerned with even the ...
Depending on the context, perhaps another option would be "smallest significant differences that exist."
I hope this helps!
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Note added at 22 hrs (2012-07-20 10:00:44 GMT)
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Lecture 1 – Basic Statistics
www.stat.purdue.edu/~colvertn/courses/stat502/.../Topic 09....
File Format: Microsoft Powerpoint - Quick View
Minimum Significant Differences. Because of the structure of the confidence interval, zero will be included in the interval if and only if the difference in means is ...
"minimum significant differences"
About 18,900 results (0.08 seconds)
https://www.google.com/search?q="minimum significant differe...
In considering this again (and seeing the results from the search above), perhaps the best option would be "minimum significant differences that exist."
diferenças mínimas significantes existentes = minimum significant differences that exist
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