It's actually good for the purposes of the study, as the highest risk populations for decreased bone mineral density are elderly populations. We know from multi

It's actually good for the purposes of the study, as the highest risk populations for decreased bone mineral density are elderly populations. We know from multiple studies that women are at highest risk due to decreasing estrogen levels post-menopause, and around peak risk around age 65 (hence why it's recommended to get osteoporosis screening done at age 65). Men aren't quite as susceptible as our testosterone levels are relatively stable, and maybe including them isn't the best of ideas. However, proportion of gender is nearly equal in all treatment arms of the study, so it shouldn't skew the results.