The number of Chinese children living in poverty has risen steadily in Hong Kong, China. However, little is known on the longitudinal effects of family socioeconomic status (SES) on cognitive-linguistic skills, word reading and writing in children from low-SES backgrounds. This study examines differences in cognitive-linguistic skills and word reading and writing across kindergarteners from the low- and middle-SES groups. It also investigates the direct link between SES and children's concurrent Chinese literacy skills and how cognitive-linguistic skills mediate the longitudinal associations between SES and word reading and writing. One hundred and nine children were assessed at Kindergarten K2 (Time 1) and reassessed at Kindergarten K3 (Time 2). Children were administered the measures of vocabulary knowledge, phonological awareness, morphological awareness, executive functioning, Chinese word reading, and Chinese word dictation at both time points. Results revealed that low-SES children performed less well on Chinese word reading and dictation than their middle-SES peers at both time points. Moreover, hierarchical regression and mediation analyses suggested that SES had a direct relation with Chinese word reading at Time 1 after controlling for age and cognitive-linguistic skills, and an indirect link with Chinese word dictation at Time 2 which was fully mediated by phonological awareness and vocabulary knowledge at Time 1. The results highlight that SES may exert an impact on children's early Chinese reading and writing and suggest the benefit of improving phonological awareness and vocabulary knowledge of low-SES children. Copyright ©Springer Netherlands.

This study examined the bidirectionality between kindergarten children's executive functioning (EF) and word reading across two time points. Participants were 523 Hong Kong Chinese-speaking children (mean age at Time 2 = 64.59 months; 52.9% male) and their parents. At Time 1, children were administered the measures of EF skills: inhibitory control, attention shifting, working memory and Chinese word reading. They were reassessed with these measures at Time 2 one year later. Results from the cross-lagged panel model revealed that, controlling for child age, gender and parental education levels, children's word reading at Time 1 was significantly predictive of their working memory at Time 2, but that the three EF skills at Time 1 were not predictive of word reading at Time 2. These findings underscored the role of early word reading in promoting children's working memory. Copyright © 2020 UKLA.