Table 1.

Mean and standard deviation (SD) of motor SDSs for ZNA-2 components and total score (results pooled over the 50 complete datasets used in multiple imputations)

ZNA-2 dimension	Mean	SD	p value*
Fine motor	0.18	0.95	0.002
Pure motor	0.10	1.01	0.194
Static balance	0.17	1.02	0.189
Gross motor	0.15	1.00	0.038
Contralateral associated movements	0.02	1.02	0.996
Total score	0.19	0.96	0.062

*The p value refers to testing for nullity of the mean SDS value while accounting for the clustered design. This is achieved by using a linear mixed effects model without any predictor while including schools as random intercepts to predict motor performance SDS on a given ZNA-2 component