A 50-year-old woman presents to your ofce to inquire about her risk of fracture related to osteoporosis. She has a positive family history of osteoporosis in her mother, but her mother never experienced any hip or vertebral fractures. The patient herself has also not experienced any fractures. She is white and has a 20-pack-year history of tobacco use, quitting 10 years prior. At the age of 37, she had a total hysterectomy with bilateral salpingo-oophorectomy for endometriosis. She is lactose intolerant and does not consume dairy products. She currently takes calcium carbonate 500 mg daily. Her weight is 115 lb, and her height is 66 in (BMI 18.6 kg/m2). All of the following are risk factors for an osteoporotic fracture in this woman EXCEPT: