Table 7.

Cumulative prospect theory parameter fits for the two groups identified by K-means cluster analysis

	Utility (α)	Weighted Probability (γ)	Stochasticity (k)
Slower
Wrist extension	0.7	1.8	2.9
	[0.11, 2.59]	[0.02, 2.4]	[0.4, 9.6]
Whole body lean	0.56	1.1	3.6
	[0.28, 1.07]	[0.4, 1.9]	[1.9, 6.4]
Faster
Wrist extension	0.41	1.5	3.9
	[0.23, 0.56]	[1.0, 1.9]	[2.1, 15.8]
Whole body lean	0.48	1.3	5.2
	[0.16, 0.78]	[0.8, 1.8]	[2.3, 12.6]

Values are medians [95% confidence interval of median]. α > 1 indicates risk-seeking behavior, γ > 1 denotes an underweighting of small probabilities, and k = 0 characterizes random choice. There were no significant differences between age groups and tasks.