Table I.

Developmental change of five factors (mean pressure, CV value, accuracy score, completion time, accuracy score/completion time) by age.

Groups	n	Age	Mean pressure(g)	CV value	Accuracy score (points)	Completion time(sec)	Accuracy score/completion time (points/sec)
4 years	26	(4.3±0.5)	186.2±105.7	0.24±0.09	0.78±0.29	12.5±4.0	0.06±0.03
5 years	29	(5.2±0.6)	153.3±47.1	0.22±0.08	0.86±0.27	13.2±3.6	0.07±0.22
6 years	20	(6.3±0.5)	233.0±84.2	0.20±0.05	1.09±0.21	14.4±4.3	0.08±0.03
7 years	18	(7.2±0.4)	267.3±110.4	0.20±0.12	1.25±0.16	14.6±3.0	0.09±0.02
8 years	17	(8.2±0.4)	266.2±89.9	0.20±0.09	1.23±0.09	13.0±4.0	0.10±0.03
9 years	20	(9.1±0.3)	237.8±100.6	0.19±0.06	1.21±0.11	13.3±3.8	0.10±0.03
10 years	17	(10.3±0.6)	262.4±94.6	0.21±0.08	1.23±0.19	11.8±4.0	0.11±0.03
11 years	16	(11.2±0.4)	213.0±75.3	0.19±0.06	1.18±0.15	11.0±3.2	0.11±0.02
Adult	17	(19.7±0.6)	237.8±76.7	0.24±0.13	1.13±0.15	12.0±3.9	0.10±0.02

CV: coefficient of variation