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The authors have noticed that during the production process some errors were introduced into table 3. Many of the 95% confidence interval ranges should be negative. We would like to apologise for these errors and the corrected table 3 is below. Also, in the abstract, a couple of numbers and one word need changing within the Results section. The following sentence should read: ‘Academic achievement was significantly below national average for all six assessed areas with z˗scores ranging from −0.24 (95% CI −0.32 to 0.16) for knowledge of world to −0.32 (−0.42 to −0.23) for physical development.’