Table 1 Changes in distance walked individually and in a group.

	Distance walked (m)		Effect size	Chances (% and qualitative) of substantial improvement
	Individual	Group
Female	616 (74)	702 (54)**	1.34	99.9; almost certain
Male	654 (61)	736 (79)*	1.17	96.7; very likely

Data are mean (SD).

*p<0.05, **p<0.01, significant difference between individual and group mean distance achieved.