Jeovany Martínez-Mesa

TL;DR: The basic elements related to the selection of participants for a health research are discussed and sample representativeness, sample frame, types of sampling, as well as the impact that non-respondents may have on results of a study are described.

TL;DR: In this article, the association between physical activity during the life course and bone mineral content or density in young adults was found more in males than in females; in weight bearing anatomical sites (lumbar spine and femoral neck) than in total body and when physical activity measurements were done from adolescence to adulthood, when evaluated in only one period.

TL;DR: Examples that help in understanding the basic concepts involved in sample size estimations are presented and proper calculation of the number of participants in a study diminishes the likelihood of errors.

TL;DR: Positive association between birth weight and bone mass was clear among children, unclear among adolescents, and weak among adults, and the effect on bone mass content was stronger than those on body mass density regardless of age.

TL;DR: Brazilian women have a higher risk of being diagnosed with late stage breast cancer and younger age than in high-income countries and Luminal-like disease is the most common molecular subtype in the country.