Stability and change in potential correlates of physical activity and association with pubertal status among Norwegian children in the transition between childhood and adolescence

Table 3 Tracking coefficients over 20 months for potential psychosocial and social-environmental correlates of physical activity

		Girls (419^a)				Boys (466^a)
		r		r'		r		r'
		T1	T2	T1	T2	T1	T2	T1	T2
Enjoyment of PA	BL	0.52	0.37	0.74	0.53	0.55	0.45	0.78	0.64
	T1	1	0.45	1	0.64	1	0.52	1	0.74
Self-efficacy	BL	0.55	0.45	0.81	0.66	0.56	0.52	0.82	0.76
	T1	1	0.49	1	0.72	1	0.53	1	0.78
Perceived parental	BL	0.54	0.50	0.77	0.71	0.51	0.47	0.73	0.67
support	T1	1	0.57	1	0.81	1	0.49	1	0.70
Perceived support from	BL	0.37	0.30	0.63	0.51	0.34	0.33	0.58	0.56
teachers	T1	1	0.35	1	0.59	1	0.38	1	0.64
Perceived support from	BL	NA	0.36	NA	0.47	NA	0.43	NA	0.56
friends	T1	1	NA	1	NA	1	NA	1	NA
Perceived environmental	BL	NA	0.30	NA	0.46	NA	0.42	NA	0.65
opportunities	T1	1	NA	1	NA	1	NA	1	NA
Perceived social inclusion^b	BL	NA	0.37			NA	0.40
	T1	1	NA			1	NA

All Spearman’s correlation coefficients are significant at 0.01 level.
r’ = coefficient corrected for attenuation using test-retest values. Test-retest was assumed to be the same at the three time points.
NA = not assessed at T1.
^aN varies slightly between variables.
^b measure not included in test-retest, therefore r’ not computed.

ISSN: 1479-5868