Follow up analyses that analyzed each extraction type separately showed that the trilinguals' L1 Cantonese subject RC scores positively predicted their L3 Mandarin subject RC scores and the result was highly significant (β = 0.78, t = 5.81, p < 0.001), while the trilinguals' Cantonese object RC scores did not predict their Mandarin object RC scores (β = 0.32, t = 1.54, p = 0.14, n.s .).
There was a marginally significant effect for Mandarin vocabulary as a predictor of the trilinguals' Mandarin RC performance: χ 2 (1) = 3.09, p = 0.079 and a marginal significance for Cantonese vocabulary as a predictor of the trilinguals' Cantonese RC performance: Cantonese χ 2 (1) = 3.62, p = 0.057), showing that, unsurprisingly, children's RC comprehension in a language improved as their vocabulary scores in the target language increased.
447), however, a dominance effect was attested, as the study reported the main effect of dominance approaching significance in 20 simultaneous Cantonese-English bilinguals ( p = 0.07), suggesting that the children made fewer head errors as their Cantonese dominance increased.