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[Concrete Column] plastic centroid vs. centroid

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According to "Reinforced Concrete - Mechanics and Design, 2nd Ed." by J. G. MacGregor,
"The moment capacity M_n for the assumed strain distribution is found 
by summing the moments of all internal forces about the centroid of the column.
...In the 1950s and 1960s moments were sometimes calculated about the plastic centroid,
...[P. 410]

Is this true?
All books are using P.C. instead of centroid.
Why did Dr. MacGregor say that?

Does the latest edition  contain the same statements?

****Wontae Kim****
Unistress Corp.
Pittsfield, MA 01201
(Tel)  413-629-2031
(Fax) 413-499-0824

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