Premium
Calcium absorptive consistency
Author(s) -
Heaney Robert P.,
Weaver Connie M.,
Lee Fitzsimmons Mary,
Recker Robert R.
Publication year - 1990
Publication title -
journal of bone and mineral research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.882
H-Index - 241
eISSN - 1523-4681
pISSN - 0884-0431
DOI - 10.1002/jbmr.5650051108
Subject(s) - correlation , consistency (knowledge bases) , absorption (acoustics) , calcium , analysis of variance , zoology , chemistry , statistics , medicine , mathematics , biology , materials science , geometry , composite material
Calcium absorption efficiency was measured two or three times each in 74 premenopausal and 142 postmenopausal women under conditions predicted to alter absorptive performance. A woman's absorptive consistency was evaluated across differing loads, differing intervals, and substances of differing intrinsic absorbability. In all these circumstances there was a statistically significant correlation between a woman's absorption under differing test situations accounting for up to 60% of the variance typically found in cross‐sectional studies. For example, when the same substance but at differing load levels was tested three times over an 8 week period, various coefficients of correlation ranged from + 0.773 to + 0.849 ( P < 0.001). Even over intervals as long as 5 years correlation of absorption fraction within individuals remained significant ( r = +0.487, P < 0.001).