Sibling Health, Schooling and Longer-Term Developmental Outcomes

40 Pages Posted: 23 Oct 2015

See all articles by Chris Ryan

Chris Ryan

University of Melbourne

Anna Zhu

RMIT University

Date Written: October 23, 2015


We explore the extent to which starting primary school earlier by up to one year can help shield children from the detrimental, long-term developmental consequences of having an ill or disabled sibling. Using data from the Longitudinal Study of Australian Children, we employ a Regression Discontinuity Design based on birthday eligibility cut-offs. We find that Australian children who have a sibling in poor health persistently lag behind other children in their cognitive development — but only for the children who start school later. In contrast, for the children who commence school earlier, we do not find any cognitive developmental gaps. The results are strongest when the ill-health in the sibling is of a temporary rather than longer-term nature. We hypothesise that an early school start achieves this by lessening the importance of resource-access inequalities within the family home. However, we find mixed impacts on the gaps in non-cognitive development.

Keywords: Educational economics, human capital, school starting age, sibling health

JEL Classification: J13, I21

Suggested Citation

Ryan, Chris and Zhu, Anna, Sibling Health, Schooling and Longer-Term Developmental Outcomes (October 23, 2015). Melbourne Institute Working Paper No. 21/15, Available at SSRN: or

Chris Ryan

University of Melbourne ( email )

185 Pelham Street
Carlton, Victoria 3053

Anna Zhu (Contact Author)

RMIT University ( email )

124 La Trobe Street
Melbourne, 3000

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