HomeTDWNAEP Analysis and ScalingEstimation of NAEP Score ScalesNAEP ScalesNumber of Items in Each Subject Area ScaleNumber of Items in Scales as Defined Before and After Scaling, Reading Long-Term Trend Assessment, by Age: 2008

NAEP Technical DocumentationNumber of Items in Scales as Defined Before and After Scaling, Reading Long-Term Trend Assessment, by Age: 2008

Number of items in scales¹ as defined before scaling, reading long-term trend assessment, by age: 2008

Age	Total
1 Single overall scale. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2008 Reading Long-Term Trend Assessment.
9	88
13	106
17	103

Number of items in scales¹ as defined after scaling,  reading long-term trend assessment, by age: 2008

Age	Total
1 Single overall scale. SOURCE: U.S. Department of Education, Institute of Education Sciences, National Center for Education Statistics, National Assessment of Educational Progress (NAEP), 2008 Reading Long-Term Trend Assessment.
9	88
13	105
17	103

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