Developmental patterns of two motor functions.
D000124:Achievement; D000367:Age Factors; D002648:Child; D002657:Child Development; D002675:Child, Preschool; D005260:Female; D005385:Fingers / Q000502:physiology; D005542:Forearm / Q000502:physiology; D006225:Hand / Q000502:physiology; D006801:Humans; D008297:Male; D009048:Motor Skills; D011930:Reaction Time; D012959:Socioeconomic Factors