3.2 Monitor the food safety program Scenario Assuming a month

Read the passage below, and then answer the question. Researchers interested in the effect of calcium supplementation on bone density conducted a 3-year study of the effect of a calcium supplement on the bone density of 70 pairs of identical twins. In each pair, one twin served as the control for the other: one twin was given the supplement, and one was not. The environment and diets of the twins were closely monitored by the researchers over the length of the study. The researchers found that twins given supplements had significantly greater increases in bone mineral density. The researchers concluded that calcium supplementation increased the rate of bone density (Johnston et al., 1992). Reference Johnston, C. C., Jr, Miller, J. Z., Slemenda, C. W., Reister, T. K., Hui, S., Christian, J. C., & Peacock, M. (1992). Calcium supplementation and increases in bone mineral density in children. The New England Journal of Medicine, 327(2), 82-87. https://doi.org/10.1056/ NEJM199207093270204 What is the best indication that this study is reliable? The authors are authorities, who all are full professors at Indiana University School of Medicine. The research design conforms to the standards of the scientific method. The study was published in a highly regarded peer-reviewed journal.

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