Table 1.

Proportion of correct trials for each sequence length and age point, and mean maximal span length (and standard deviations).

	Proportion of correct trials					Mean maximal span length
	2 items	3 items	4 items	5 items	6 items
Age 3;9	52.2% (N=146)	17.8% (N=117)	6.0% (N=44)	0% (N=7)	--	2.4 (.6)
Age 4;6	74.9% (N=176)	41.9% (N=169)	23.2% (N=107)	3.4% (N=49)	0% (N=5)	2.9 (.9)
Age 5;3	85.4% (N=207)	65.1% (N=207)	39.5% (N=182)	4.5% (N=133)	2.1% (N=16)	3.6 (.8)
Age 7	98.0% (N=125)	95.0% (N=124)	79.7% (N=125)	29.6% (N=124)	9.7% (N=70)	4.7 (.7)
Age 8	98.5% (N=168)	94.9% (N=168)	83.3% (N=168)	37.9% (N=165)	14.3% (N=116)	4.9 (.8)
Age 9	98.6% (N=178)	67.7% (N=178)	87.6% (N=178)	46.8% (N=176)	18.8% (N=134)	5.1 (.9)
Age 10	99.6% (N=114)	97.0% (N=114)	88.3% (N=114)	58.5% (N=113)	21.6% (N=100)	5.4 (.8)
Adults	100% (N=21)	93.3% (N=21)	92.5% (N=21)	66.7% (N=20)	43.6% (N=15)	6.1 (1.11)