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. Author manuscript; available in PMC: 2015 Jan 21.
Published in final edited form as: J Speech Lang Hear Res. 2011 Dec 23;55(1):55–69. doi: 10.1044/1092-4388(2011/09-0257)

Figure 2.

Figure 2

Growth in letter–word W scores (which are a variation of the Rasch ability scale in which a score of 500 represents the achievement of a typically developing 10-year-old and in which the SD = 15) in first (Months 1–7, x-axis) and second (Months 11–18) grades (top) and growth in passage comprehension W scores in first and second grades (bottom) as a function of ΔDVAR (the change in percentage of dialect variation score from first through second grade) in which greater decreases in slope are associated with stronger reading skills overall. ΔDVAR is modeled at the 25th and 75th percentile for the sample or ΔDVAR scores of −3.6 points per month (solid line) and −0.8 points per month (dotted line), respectively (mean ΔDVAR = −2.24).