Cooper R, Muniz-Terrera G, Kuh D. Associations of behavioural risk factors and health status with changes in physical capability over 10 years of follow-up: the MRC National Survey of Health and Development. BMJ Open 2016;6:e009962. doi: 10.1136/bmjopen-2015-009962
The first line of the methods reads:
‘The NSHD is a socially stratified sample of 5362 singleton births (2547 males and 2815 females)’
however, this should have read:
‘The NSHD is a socially stratified sample of 5362 singleton births (2815 males and 2547 females)’.