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. 2023 Oct 26;44(1):74–95. doi: 10.1177/01427237231204167

Table 2.

Expressive vocabulary – combined measures.

Predictors Word vocabulary Concept vocabulary
Estimates Std. beta Estimates CI p Estimates Std. beta Estimates CI p
Intercept 144.74 −0.04 133.56 to 155.92 <.001 144.78 0.05 135.82 to 153.74 <.001
Age (linear term) 5056.33 22.88 4764.92 to 5347.74 <.001 5059.74 26.46 4826.97 to 5292.51 <.001
Age (quadratic term) 1131.38 5.12 829.37 to 1433.40 <.001 1128.41 5.90 887.07 to 1369.76 <.001
Bilingual 20.28 0.09 3.21 to 37.36 .020 −17.82 −0.09 −31.50 to −4.13 .011
Age (linear term) × bilingual 810.61 3.67 342.56 to 1278.65 .001 −621.68 −3.25 −995.63 to −247.73 .001
Age (quadratic term) × bilingual 267.18 1.21 −197.50 to 731.87 .259 −133.17 −0.70 −504.36 to 238.02 .482
Marginal R2/conditional R2 .702/.826 .743/.853

CI: confidence interval.