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There is a difference between the bone density of males and females over 50 years old (Figure 1). (t-test: t = 2.06, df = 38, P < 0.05)

Bone density graph
Figure 1. Bone density in healthy women and men over 50.
(Data from Liz Smith, MRC Human Nutrition Research Laboratory, cited in Hawkins, D (2009) Biomeasurement 2nd edition. Oxford University Press, Oxford)