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Monolingual children’s scores on the Quick Interactive Language Screener (QUILS) by social class (maternal education) plotted by age and by area on the QUILS. The main effect of socioeconomic status (SES) was significant, and there were no significant interactions with age or QUILS area. ***p < .0001. (From Levine, Pace, Hirsh-Pasek, & Golinkoff, under review.)
