May 2021: The analysis in the section on Parental Wellbeing was initially published using raw SWEMWBS scores, rather than ‘Rasch-transformed’ scores as is advised under the WEMWBS licence. The analysis has been corrected so it is based on Rasch-transformed scores. Figures for parental SWEMWBS scores in the text on p49 and in Table 9 have been revised. This did not reflect errors in the underlying data or in any other results in the publication. We apologise for any inconvenience caused.