Table 5. Item difficulties.

		Sample A		Sample B		Sample C
time frame	type of activity	N	item difficulty	N	item difficulty	N	item difficulty
previous 3 weeks	end with low I	55	1.87	25	2.6	5	1.9
	end with mod I	55	2.18	26	2.19	58	2.41
	end with high I	51	1.31	24	1.75	58	2.21
	speed/strength	52	1.25	25	2.4	58	2.69
	transport	54	1.87	25	2.24	58	2.6
previous 3 years	end with low I	54	1.98	25	2.44	60	2.33
	end with mod I	55	2.00	26	2.46	60	2.47
	end with high I	53	1.02	24	1.96	60	2.28
	speed/strength	54	1.41	25	2.76	60	3.07
	transport	55	2.13	26	2.27	60	2.65
between 40 & 60 years	end with low I	24	1.62
	end with mod I	24	1.92
	end with high I	23	1.09
	speed/strength	23	1.13
	transport	22	1.50
between 20 & 40 years	end with low I	49	1.98	24	2.5	25	2.28
	end with mod I	49	2.16	25	2.4	25	2.44
	end with high I	48	1.12	24	2	25	2.28
	speed/strength	49	1.35	24	2.46	25	2.96
	transport	49	2.04	24	2.25	25	2.68
youth	end with low I	55	1.96	25	2.44	59	2.49
	end with mod I	55	2.24	26	2.31	58	2.41
	end with high I	53	1.32	25	2.04	58	2
	speed/strength	53	1.72	25	2.68	59	2.78
	transport	55	2.20	25	2.44	59	2.63

I: intensity; mod: moderate; end: endurance.