Table 8. Mean digital features value of each features according to their clustering.

Demographic characteristics and BHK scores of children with dysgraphia corresponding to the 3 clusters.

Category	Feature	Cluster 1 (n = 13)	Cluster 2 (n = 25)	Cluster 3 (n = 24)	p-value
Statics	Space Between Words	1.3⋅103(3⋅102)	7.2⋅102(2.9⋅102)	1.4⋅103(6⋅102)	<0.001
	Median of Power Spectral of Tremor Freq.	3.2⋅10−3(1.5⋅10−4)	3.3⋅10−3(9.7⋅10−5)	3.3⋅10−3(1.2⋅10−4)	0.055
	SD of Handwriting Density	1.7⋅102(73)	2.3⋅102(1.3⋅102)	2.5⋅102(1.2⋅102)	0.161
Kinematics	Median of Power Spectral of Speed Freq.	1.4⋅10−3(1.6⋅10−4)	2.2⋅10−3(2.8⋅10−4)	1.9⋅10−3(2.8⋅10−4)	<0.001
	Distance to mean of Speed Freq	2.1⋅10−4(9.6⋅10−5)	7.7⋅10−4(3.5⋅10−4)	4.1⋅10−4(2.7⋅10−4)	<0.001
	In Air Time Ratio	5.3⋅10−1(7.8⋅10−2)	5.9⋅10−1(1.1⋅10−1)	6⋅10−1(1.4⋅10−1)	0.104
Pressure	Mean Pressure	4.6⋅102(1.4⋅102)	3.2⋅102(1.1⋅102)	4.6⋅102(1.4⋅102)	0.001
	Mean Speed of Pressure Change	3.1⋅10−1(1.3⋅10−1)	3.8⋅10−2(3.5⋅10−2)	6.5⋅10−2(5.6⋅10−2)	<0.001
	SD of speed of Pressure Change	28(7.5⋅10−1)	13(4⋅10−1)	20(5.1⋅10−1)	<0.001
Tilt	Median of Power Spectral of Tilt-y Freq	3.3⋅10−3(1.5⋅10−5)	3.3⋅10−3(3.1⋅10−5)	3.3⋅10−3(5.5⋅10−5)	0.001
	Distance to Mean of Tilt-x Freq	2.3⋅10−4(3.3⋅10−5)	2.8⋅10−4(9.6⋅10−5)	6.3⋅10−4(1.9⋅10−4)	<0.001
	Bandwidth_tilt x Freq.	3.4⋅10−3(2.8⋅10−4)	3.5⋅10−3(3.8⋅10−4)	4.4⋅10−3(2.9⋅10−4)	<0.001
Clinical description	Grade	4.08 (0.86)	3.32 (1.18)	3.00 (0.93)	0.016
	Gender (F/M)	8/5	4/21	6/18	0.016
	Laterality (L/R)	0/13	1/24	4/20	0.212
	Recruited in Specialized Clinic	0	25	24	<0.001
	BHK handwriting quality Score	-2.73 (0.65)	-3.49 (1.25)	-3.44 (1.41)	0.109
	BHK handwriting speed Score	0.46 (1.16)	-1.24 (1.00)	-1.10 (0.91)	<0.001

The clustering was done on the digital features only