http://www.voxy.co.nz/national/research-finds-no-advantage-learning-read-age-five/5/33888
"At the end of the study, the data was analysed using Hierarchical Linear Modelling, which is commonly used in longitudinal studies, and a particularly robust way to analyse data, and estimated the point at which the early starters and later starters of learning to read met - and it came up with 10.89 years - between 10 and 11 years of age," he says.
"It was very exciting and unexpected - one of those science moments. The results concurred with the results of the other two studies and there were no differences in the abilities of the early and later readers by 11."