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. Author manuscript; available in PMC: 2023 Apr 1.
Published in final edited form as: Cogn Dev. 2022 Feb 26;62:101167. doi: 10.1016/j.cogdev.2022.101167

Table 6.

Results for Mixed-Effects Regression Models for Study 2

Variable B (SE) t 95% CI p
Model 1
 Contrast 1: Arithmetic vs. Correct 44 (.07) 6.27 [.30, .58] <.001
 Contrast 2: Arithmetic vs. Other-Incorrect −.35(.09) −3.94 [−.53, −0.18] <.001
Model 2
 Contrast 1: Arithmetic vs. Correct .34(.09) 3.76 [.15, .52] <.001
 Contrast 2: Arithmetic vs. Other-Incorrect −.39(.10) −3.87 [−.59, −.19] <.001

Note. Model 1 included all items and Model 2 included a subset of items as the easier items (i.e., problems with operations on the right side only) were removed. Strategy Type was dummy-coded with the “Arithmetic Strategies” as the reference group.