Table 1

Cohort demographics: for demographics that are constant across years, the number of individuals over the whole study period is provided; for demographics that do change across years, such numbers are not meaningful and these are marked ‘N/A’

Number of persons in the cohortFinancial yearStudy period (1 April 2009–30 March 2014)
2009/20102010/20112011/20122012/20132013/2014
Overall cohort12 03912 93013 75614 57315 40420 436
Age group
 <1 year11631085108710551096N/A
 1–5 years34703552363736833687N/A
 6–10 years18872330272931463452N/A
 11–15 years16641748184419922086N/A
 16–20 years18181960206822122388N/A
 21–25 years20372255239124852695N/A
Sex
 Male6547696474147916833311 217
 Female549059646340665470689215
Deprivation category
 1 (most deprived)30413275347836553897N/A
 225882780296131993370N/A
 323402462262427722915N/A
 420432262244525612723N/A
 5 (least deprived)20082128222723582452N/A
Ethnic group
 White8558938110 26111 02011 85114 878
 South Asian257287323350380455
 Black63657592107139
 Mixed/Other133172213234280344
 Unknown302830252884287727864620
Primary diagnostic category
 Neurology15471626167817651884N/A
 Haematology655723782854905N/A
 Oncology17981903199720752169N/A
 Metabolic317356395444491N/A
 Respiratory12191292134714051441N/A
 Circulatory682750782819855N/A
 Gastrointestinal202210215220220N/A
 Genitourinary7638479009531004N/A
 Perinatal10961148120112671308N/A
 Congenital36894007439147015047N/A
 Other7168687080N/A