NUMBAT OER - Open Educational Resources

There is a difference between the bone density of males and females over 50 years old (Figure 1). (Mann-Whitney U test: U = 120.5, n1 = 20, n2 = 20, 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)