Psychometric properties of PGU (Guo et al., 2019) GuoLing-Yu EisenbergSarita SchneiderPhyllis SpencerLinda 2019 <div><b>Purpose: </b>The purpose of this article was to provide the reference data and evaluate psychometric properties for the percent grammatical utterances (PGU; Eisenberg & Guo, 2013) in children between 4 and 9 years of age from the database of the Edmonton Narrative Norms Instrument (ENNI; Schneider, Dubé, & Hayward, 2005).</div><div><b>Method: </b>Participants were 377 children who were between 4 and 9 years of age, including 300 children with typical language (TL) and 77 children with language impairment (LI). Narrative samples were collected using the ENNI protocol (i.e., a story generation task). PGU was computed from the samples. Split-half reliability, concurrent criterion validity, and diagnostic accuracy for PGU were further evaluated.</div><div><b>Results: </b>PGU increased significantly in children between 4 and 9 years of age in both the TL and LI groups. In addition, the correlation coefficients for the split-half reliability and concurrent criterion validity of PGU were all large (<i>r</i>s ≥ .557, <i>p</i>s < .001). The diagnostic accuracy of PGU was also good or acceptable from ages 4 to 9 years.</div><div><b>Conclusions: </b>With the attested psychometric properties, PGU computed from the ENNI could be used as an assessment tool for identifying children with LI between 4 and 9 years of age. The reference data of PGU could also be used for monitoring treatment progress.</div><div><br></div><div><b>Supplemental Material S1.</b> Computation of PGU. </div><div><br></div><div><b>Supplemental Material S2.</b> Frequency and percentage of each error type and number and percentage of children who produced each error type by language status and age.</div><div><br></div><div><b>Supplemental Material S3.</b> <i>F</i> values, <i>p</i> values, and effect sizes (<i>d</i>) for the group differences in total number of C-units, mean length of C-units in morphemes (MLCUm), number of different words (NDW), and number of C-units for the PGU analysis (# of CU for PGU) by age.</div><div><br></div><div><b>Supplemental Material S4. </b><i>Z</i> score and confidence interval calculation.</div><div><br></div><div><b>Supplemental Material S5. </b>Indices of diagnostic accuracy for PGU using prescriptive cutoff scores.</div><div><br></div><div>Guo, L.-Y., Eisenberg, S., Schneider, p., & Spencer, L. (2019). Percent grammatical utterances between 4 and 9 years of age for the Edmonton Narrative Norms Instrument: Reference data and psychometric properties. <i>American Journal of Speech-Language Pathology</i><i>, </i><i>28</i>(4), 1448–1462<i>.</i> https://doi.org/10.1044/2019_AJSLP-18-0228</div>