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Table 39. Percentage of children demonstrating specific cognitive and motor skills, by child's age at assessment: 2001
______________________________________________________________________________________________________________________________________________________
                                        |   Percentage of children 8 through 10 months  |   Percentage of children 11 through 13 months  |  Percentage
                                        |_______________________________________________|________________________________________________| of children
                                        |           |          8|          9|         10|           |         11|         12|          13|  14 through
Specific ability                        |      Total|     months|     months|     months|      Total|     months|     months|      months|   22 months
________________________________________|___________|___________|___________|___________|___________|___________|___________|____________|____________
1                                       |          2|          3|          4|          5|          6|          7|          8|           9|          10
________________________________________|___________|___________|___________|___________|___________|___________|___________|____________|____________
     Survey population percentage ......|72.2 (0.98)|16.1 (0.82)|34.8 (0.71)|21.3 (0.61)|20.9 (0.79)|10.6 (0.49)| 6.2 (0.37)|  4.1 (0.30)|  6.5 (0.50)
                                        |           |           |           |           |           |           |           |            |
Cognitive abilities                     |           |           |           |           |           |           |           |            |
  Explores objects in play .........    |99.2 (0.03)|98.7 (0.06)|99.2 (0.02)|99.4 (0.03)|99.8 (0.02)|99.7 (0.04)|99.9 (0.01)|100.0 (0.01)|100.0 (0.01)
  Explores with purpose .............   |87.8 (0.38)|79.6 (0.75)|88.0 (0.31)|93.8 (0.27)|97.4 (0.14)|96.4 (0.26)|98.8 (0.08)| 99.4 (0.05)| 99.3 (0.10)
  Babbles ..............................|46.7 (0.41)|37.9 (0.48)|45.2 (0.33)|55.8 (0.53)|72.1 (0.43)|64.9 (0.57)|76.7 (0.63)| 84.1 (0.57)| 89.0 (0.62)
  Early problem solving .............   | 3.4 (0.11)| 1.4 (0.08)| 2.7 (0.07)| 6.0 (0.21)|17.2 (0.46)|11.2 (0.49)|20.1 (0.77)| 28.4 (0.98)| 46.4 (1.47)
  Uses words .........................  | 0.5 (0.02)| 0.2 (0.01)| 0.4 (0.01)| 1.0 (0.05)| 5.0 (0.25)| 2.7 (0.23)| 5.9 (0.42)|  9.9 (0.66)| 26.7 (1.42)
                                        |           |           |           |           |           |           |           |            |
Motor abilities                         |           |           |           |           |           |           |           |            |
  Eye-hand coordination ................|90.7 (0.13)|87.7 (0.25)|90.6 (0.16)|93.1 (0.13)|96.4 (0.11)|95.3 (0.16)|97.1 (0.16)| 98.2 (0.17)| 99.0 (0.09)
  Sitting .........................     |93.4 (0.13)|90.4 (0.28)|93.4 (0.16)|95.7 (0.13)|98.2 (0.08)|97.4 (0.13)|98.6 (0.12)| 99.3 (0.12)| 99.6 (0.06)
  Prewalking .......................    |73.2 (0.40)|63.4 (0.75)|72.9 (0.49)|81.1 (0.43)|91.4 (0.33)|88.1 (0.52)|93.6 (0.47)| 96.4 (0.53)| 98.2 (0.22)
  Independent walking ..................|18.5 (0.37)|10.4 (0.44)|16.8 (0.41)|27.4 (0.63)|55.2 (1.06)|42.9 (1.33)|62.2 (1.77)| 76.4 (1.93)| 89.1 (1.04)
  Balance ............................  | 1.1 (0.04)| 0.5 (0.03)| 0.9 (0.03)| 1.9 (0.10)|10.1 (0.50)| 5.0 (0.36)|12.6 (0.95)| 19.8 (1.34)| 43.1 (1.86)
________________________________________|___________|___________|___________|___________|___________|___________|___________|____________|____________
NOTE: This table is based on a survey that sampled children at or about 9 months of age. Standard errors appear in parentheses.
SOURCE: U.S. Department of Education, National Center for Education Statistics, Children Born in 2001: First Results from the Base Year of the Early Childhood Longitudinal Study, Birth Cohort, 2005. (This table was prepared February 2006.)

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