NAEP 2017 results will be released soon. Check out the NAEP Reading Framework that formed the foundation of the assessment.
Topic

Reading Framework and Specifications

Assessment Framework

2017 Reading Framework

Frameworks describe the content and design of each NAEP subject area assessment.

2017 Abridged Framework

An abridged version of the full assessment framework, written for a general audience.

Assessment and Item Specifications

2009 Reading Specifications

Specifications describe the detailed blueprint used for constructing the assessment.