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. Author manuscript; available in PMC: 2020 Aug 1.
Published in final edited form as: J Autism Dev Disord. 2019 Aug;49(8):3412–3425. doi: 10.1007/s10803-019-04057-2

Table 4.

Assessing Predictors of Expository Writing

Predictor β t Sig. Model Adjusted R2
Productivity
 Diagnostic Group 0.29 1.96 0.06 F(5, 46) = 6.88, .44
 Chronological Age 0.54 3.66 0.001 p = .0001
 Core Language Score −0.08 0.51 0.62
 Executive Dysfunction −0.24 −1.60 0.12
 Cognitive Flexibility 0.27 1.83 0.08
Frequency of Rare Words
 Diagnostic Group −0.65 −3.76 0.001 F(5, 46) = 3.39, .24
 Chronological Age −0.30 −1.76 0.09 p = .014
 Core Language Score 0.05 0.26 0.79
 Executive Dysfunction −0.08 −0.44 0.66
 Cognitive Flexibility 0.09 0.47 0.64
Frequency of Grammatical Errors
 Diagnostic Group −0.48 −2.64 0.01 F(5, 46) = 2.41, .17
 Chronological Age −0.17 −0.96 0.35 p = .058
 Core Language Score −0.05 −0.24 0.81
 Executive Dysfunction −0.06 −0.35 0.73
 Cognitive Flexibility −0.18 −0.97 0.34

Note. Executive dysfunction was measured using the Global Executive Composite score from the BRIEF-2. Cognitive flexibility was measured using the Perseverative Error standard score from the WCST-64.