Table 3

Discriminative features for each task by ET phenotype

Task	Feature	Control (median±SD)	ET-0 (median±SD)	ET+1 (median±SD)	ET+2 (median±SD)	P value	Spearman correlation coefficient
Writing tasks
1	stdStrLen	13.35±26.3	21.01±120	41.15±29.15	70.62±57.71	0.078*	0.51
1	avgStrLenAir	83.77±35.47	99.18±63.96	76.75±18.41	128.08±37.9	0.077*	0.35
2	totalT	6.2±0.42	6.33±0.24	6.14±0.19	6.58±0.21	0.01*	0.39
2	ratioAxAy	1±0.21	0.90±0.14	0.66±0.25	1.41±0.62	0.03*	0.46
3	avgDiffP	620.3±274.71	639.4±275.25	686±190.2	440±135.17	0.06*	−0.34
3	ratioAirSurT	0.67±0.37	0.58±0.38	0.78±0.25	0.51±0.17	0.07*	−0.25
4	medAx	1±0.62	0.5±0.18	0.5±0.22	1±0.92	0.03*	0.59
4	avgAx	2.5±4.3	1.39±0.6	1.23±3.7	2.87±7.44	0.053*	0.55
Drawing tasks
5a	avgDiffP	93.92±40.71	88.22±35.65	159.32±25.56	171.05±155.51	0.018*	0.60
5a	skewDiffP	18.86±7.23	17.80±4.37	10.35±6.12	8.72±6.57	0.030*	−0.56
5b	medAx	0.25±0.07	0.25±0.20	0.50±0.11	0.875±1.92	0.042*	0.58
5b	Dxy	33.5±16.49	39±104.11	120±55.41	176.50±206.5	0.068*	0.54
6	medVx	4.75±1.24	3.25±3.80	6±4.07	16.25±15.31	0.013*	0.66
	maxAngS	21.17±28.0	21.15±9.44	22.01±8.73	16.76±59.76	0.016*	−0.54
	minStrLenAir	82.50±41.65	103.50±54.12	9±48.59	7.50±30.45	0.017*	−0.65
	maxJx	50.08±86.2	50.26±22.0	50.19±19.9	39.29±170.2	0.018*	−0.56

All features with p<0.05 are shown, otherwise the two features with lowest p values for each task. The p values and Spearman correlation coefficients were calculated for ET-0, ET+1 and ET+2.
*By Kruskal-Wallis.
ET, essential tremor.