Table 2.

Regression coefficients and 95% confidence intervals (CI) for the linear effect of BMI z-scores on motor performance for ZNA-2 components and the total score, after controlling for ISEI and cluster effects (results pooled over the 50 complete datasets used in multiple imputations). The reported estimate corresponds to an increase of 1.35 points on the z-score scale for BMI (corresponding to the interquartile range of a standard normal distribution)

ZNA-2 dimension	Estimate	95% CI	p value
Fine motor	0.04	[− 0.10; 0.17]	0.615
Pure motor	0.26	[0.11; 0.40]	0.001
Static balance	Nonlinear effect (see Fig. 1)		*0.023
Gross motor	Nonlinear effect (see Fig. 1)		*0.013
Contralateral associated movements	0.13	[− 0.02; 0.28]	0.086
Total score	0.07	[− 0.07;0.20]	0.360

*The p values reported for nonlinear effects were obtained using a likelihood ratio test (LRT)