Assessment of Validity of Children’s Movement Skill Quotient (CMSQ) Based on the Physical Education Classroom Environment

Table 5

Differential item functioning across age groups (7 years vs. 8 years; 8 years vs. 9 years).

Item	Age (7 years old= Ref. vs. 8 years old)					Age (8 years old= Ref. vs. 9 years old)
	DIF	Joint	Rasch-Welch			DIF	Joint	Rasch-Welch
	Contrast	SE	t	df	Prob.	Contrast	SE	t	df	Prob.
CS01	1.15	0.51	2.24	295	0.03^b	0.13	0.69	0.19	317	0.85
CS02	–0.25	0.39	–0.64	348	0.52	0.22	0.44	0.50	322	0.62
CS03	–0.04	0.34	–0.13	348	0.90	0.41	0.32	1.31	325	0.19
CS04	–0.05	0.25	–0.20	347	0.84	–0.09	0.26	–0.36	335	0.72
CS05	0.38	0.25	1.52	346	0.13	–0.26	0.26	–0.98	335	0.33
CS06	0.12	0.26	0.46	345	0.64	–0.21	0.28	–0.76	334	0.45
CS07	0.08	0.25	0.34	347	0.74	–0.13	0.26	–0.51	335	0.61
CS08	–0.02	0.25	–0.08	347	0.94	0.02	0.27	0.08	334	0.94
CS09	0.06	0.29	0.22	348	0.83	–0.18	0.28	–0.62	335	0.53
CS10	0.38	0.30	1.26	348	0.21	–0.17	0.29	–0.61	335	0.54
CS11	–0.05	0.27	–0.16	346	0.87	0.21	0.30	0.68	329	0.50
CS12	–0.57	0.27	–2.08	348	0.04^b	0.49	0.29	1.67	325	0.10
CS13	–0.11	0.25	–0.46	347	0.65	0.49	0.26	1.85	333	0.07
CS14	–0.41	0.27	–1.56	345	0.12	–0.47	0.28	–1.69	335	0.09

Note: DIF: differential item functioning; t: t-statistic; df: degrees of freedom; ^b; SE: standard errors of the measures.