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a history of dietary supplement with calcium was recorded among 10,000 women over the age of 50. the women were followed for 2 years to determine if they experienced hip fracture. calcium supplementation was reported by 31% of women who experienced hip fracture and by 46% of women without hip fractures. in a case-control study with equal numbers of cases and controls, what is the number of women with a hip fracture who are not taking calcium supplements?