Table 1.

Factors extracted from 87 kinematic variables, and their relationship with Movement Assessment Battery for Children Second Edition (MABC-2) and Developmental Coordination Disorder Questionnaire (DCDQ′07) scores.

Factor	Loadings ≥± 0.3 (N)	Description†	Variance explained (%)	Correlation with MABC-2 component scores, r185 (stepwise regression coefficient ±SE)				Correlation with DCDQ′07 scores, r83
				MD	A&C	B	T	C	F	G	T
1	50	–	25.4	0.050	0.020	0.051	0.054	0.019	0.111	0.069	0.069
2	40	–	13.0	-0.040	0.010	-0.016	-0.023	-0.127	-0.068	-0.068	-0.106
3	31	–	10.3	0.022	-0.067	-0.007	-0.014	-0.086	-0.024	-0.048	-0.066
4	18	‘Temporal variability; slow corrections’	6.48	0.050	0.134	0.111	0.118	-0.068	0.118	0.032	0.016
5	18	–	5.24	-0.186∗	-0.140	-0.183∗	-0.217∗	-0.202	-0.016	0.011	-0.093
6	14	‘Jerk, path, correction latency, curvature’	4.48	-0.210∗ (-1.55 ± 0.537)	-0.357∗ (-1.77 ± 0.344)	-0.182∗	-0.294∗ (-4.77 ± 1.14)	-0.079	-0.123	-0.051	-0.093
7	8	‘Additional movement during corrections’	2.99	0.031	-0.139	0.169	0.055	0.223	0.110	0.130	0.187
8	3	‘Early peak grip aperture’	2.51	0.000	-0.064	-0.034	-0.036	0.067	-0.090	0.038	0.020
9	5	‘High correction magnitude variability; long paths’	2.45	0.089	0.060	0.032	0.074	-0.194	-0.038	-0.143	-0.158
10	4	‘Additional acceleration/jerk; correction variability’	2.12	0.020	-0.031	0.027	0.013	0.037	0.085	-0.050	0.022
11	5	‘Low correction magnitude and grip timing variability’	2.06	0.129	0.177	0.103	0.163	0.038	-0.146	0.002	-0.024
12	4	‘Smaller, later peak grip aperture’	1.76	0.044	0.032	0.091	0.074	0.034	0.132	0.122	0.103
13	5	‘Slow RT; long correction paths’	1.66	-0.047	0.036	0.129	0.053	-0.122	-0.057	-0.131	-0.125
14	0	(‘Path variability’)	1.53	0.213∗	0.136	0.148	0.211∗	-0.036	-0.001	-0.049	-0.037
15	3	‘Variable and late peak grip aperture’	1.32	0.235∗ (1.68 ± 0.517)	0.194∗ (0.918 ± 0.332)	0.199∗ (1.54 ± 0.573)	0.264∗ (4.12 ± 1.10)	0.196	0.231	0.215	0.244
16	2	‘Long reaction time’	1.29	-0.134	-0.092	-0.082	-0.129	-0.092	-0.148	-0.054	-0.107
17	2	‘Variable peak grip aperture; straight reaches’	1.16	-0.001	-0.164	-0.083	-0.091	-0.091	-0.130	-0.118	-0.127

^†Descriptions are subjective and approximate; a full list of factor coefficients is provided in the Supplementary Data Sheet 4. MD, Manual dexterity; A&C, Aiming and catching; B, Balance; T, Total; C, Coordination during movement; F, Fine motor; G, General. ^∗p ≤0.0125 (corrected for four comparisons per factor). Values in parentheses are the coefficients ± standard errors of the factors that remained as significant predictors in a stepwise linear regression (p < 0.0125).