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. Author manuscript; available in PMC: 2010 Jul 1.
Published in final edited form as: Neuropsychology. 2009 Jul;23(4):460–474. doi: 10.1037/a0015676

Table 2.

Children’s Age by Birth Weight Groups for Each Assessment

Age
Period		 Actual Age
M (SD)		 N at each
Age Period		 Term Age
M (SD)(n)		 750–1499 g Age
M (SD)(n)		 <750 g Age
M (SD)(n)
7 6.87 (0.93) 178 7.00 (1.00) (52) 6.91 (0.89) (64) 6.72 (0.92) (62)
10 9.98 (0.33) 66 10.02 (0.31) (22) 9.92 (0.35) (22) 9.99 (0.32) (22)
11 11.02 (0.31) 107 11.04 (0.31) (38) 10.97 (0.31) (32) 11.03 (0.30) (37)
12 12.01 (0.30) 127 11.99 (0.31) (47) 11.96 (0.31) (36) 12.07 (0.27) (44)
13 13.02 (0.30) 142 12.98 (0.29) (52) 13.01 (0.33) (43) 13.05 (0.28) (47)
14 13.94 (0.31) 90 13.96 (0.33) (35) 13.91 (0.31) (27) 13.94 (0.28) (28)
15 15.15 (0.27) 61 15.12 (0.35) (20) 15.18 (0.22) (22) 15.15 (0.30) (19)
16 16.12 (0.37) 103 16.11 (0.37) (35) 16.14 (0.40) (36) 16.10 (0.34) (32)

Note. Term = Full-term; 750–1499 g = 750–1499 g birth weight; <750 g = <750 g birth weight.