Calcium absorptive consistency.

Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research

PubMedID: 2270777

Heaney RP, Weaver CM, Fitzsimmons ML, Recker RR. Calcium absorptive consistency. J Bone Miner Res. 1990;5(11):1139-42.
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 less than 0.001). Even over intervals as long as 5 years correlation of absorption fraction within individuals remained significant (r = +0.487, P less than 0.001).