Motor skill competence and moderate- and vigorous-intensity physical activity: a linear and non-linear cross-sectional analysis of eight pooled trials

Table 3 Linear and non-linear associations between skill competence scores (measured via the TGMD) and moderate and vigorous physical activity

Outcome	Exposure	Sample (n)	Linear association			Non-linear association^a	Sex interaction^b
Physical activity (3 days)		988	β^c	B (95% CI)	p-value	p-value	p-value
MPA	Total	836	0.31	0.27 (0.19, 0.34)	< 0.0005	0.001	0.14
VPA	Total	836	0.41	0.30 (0.23, 0.37)	< 0.0005	< 0.0005	0.21
MPA	Locomotor	861	0.20	0.36 (0.22, 0.50)	< 0.0005	0.19	0.19
VPA	Locomotor	861	0.28	0.43 (0.31, 0.55)	< 0.0005	0.35	< 0.0005
MPA	Object Control	963	0.26	0.35 (0.24, 0.46)	< 0.0005	< 0.0005	0.63
VPA	Object Control	963	0.33	0.39 (0.29, 0.49)	< 0.0005	< 0.0005	0.28

^a p-value for likelihood-ratio test comparing the non-linear restricted cubic spline model to the linear model. Lower p-values indicate more evidence that the non-linear model provides a better fit to the data than the linear model
^b Sex interactions were examined using linear association models for the locomotor skills exposure models, and non-linear restricted cubic spline models for the object control and total skills models as these had shown evidence (at the p < .05 level) of non-linearity in the overall models
^c Standardised linear association
MPA Moderate-intensity physical activity, VPA Vigorous-intensity physical activity

ISSN: 1479-5868