Table 5.

Reliability, test–retest, and systematic differences in knowledge and understanding questions from the CAPL-2 battery assessment.

KU	Test (n = 69)			Retest (n = 69)				Reliability test
	M	SD	Item-total correlation	M	SD	Item-total correlation	Cronbach’s α	ICC (95% CI)	P-value†	SEM	%SEM	MDC	MDC%
Physical activity (PA) guidelines	0.51	0.50	0.332**	0.64	0.48	0.349**	0.737	0.567	0.020	0.33	56.8	0.90	157.4
Cardiorespiratory fitness definition	0.72	0.45	0.546**	0.78	0.41	0.408**	0.820	0.692	0.157	0.24	31.9	0.67	88.3
Muscular endurance definition	0.75	0.43	0.409**	0.83	0.38	0.353**	0.765	0.614	0.096	0.25	32.1	0.70	88.9
Improve sport skills	0.43	0.50	0.398**	0.45	0.50	0.390**	0.848	0.738	0.739	0.26	57.9	0.71	160.6
PA comprehension	4.77	1.15	0.798**	4.81	1.09	0.810**	0.894	0.809	0.602	0.49	10.2	1.36	28.3
Total KU domain score	7.19	1.72	N/A	7.51	1.55	N/A	0.885	0.781	0.015	0.76	10.4	2.12	28.8

KU, knowledge and understanding; M, mean; SD, standard deviation; 95% CI, confidence interval of 95%; ICC, intraclass correlation coefficient; SEM, standard error of measurement; %SEM, standard error of measurement as a percentage; MDC, minimum detectable change; N/A, not applicable; ^†Friedman test p-values; **p < 0.01 for item-total correlation. Item-total correlation refers to the magnitude of the association between each item and its domain.