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Technical Appendix

The London Intelligence | Health and wellbeing

Technical Appendix

Adult obesity

Data are based on the Active Lives survey data from Sport England collected by IPSOS-MORI for Public Health England (PHE). Data is weighted and based on self-reported height and weight survey questions. Annual data is available for the UK at the local-authority level. Data from 2015/16 is not directly comparable to earlier years due to methodological changes. Adults are defined as overweight (including obese) if their body mass index (BMI) is greater than or equal to 25kg/m2. More information can be found here. Retrieved from here.

Childhood obesity

Data are from the National Child measurement Programme (NCMP), which feeds into the PHE’s Child Obesity Profile series. Data is available by borough for every year from 2006/07 to 2017/18. Retrieved from here.

The NCMP measures the height and weight of children in Reception class (aged 4 to 5) and year 6 (aged 10 to 11), to assess overweight and obesity levels in children within primary school. Local authorities are asked to collect data on children’s height and weight from all state-maintained schools within the area. Data are submitted to NHS Digital, and all of the returns are collated and validated centrally. PHE provide operational guidance to local authorities and schools. A different definition of obesity is used for children than for adults. More information can be found here.

Adult physical activity

Data are based on the Active Lives survey data from Sport England collected by Ipsos Mori for PHE. Annual data is available for the UK at the local-authority level for 2015/16, 2016/17 to 2017/18. Retrieved from here.

The indicator measures the number of respondents aged 19 and over, with valid responses to questions on physical activity, doing at least 150 moderate intensity equivalent minutes physical activity per week as a percentage of the total number of respondents aged 19 and over.

NHS and WHO guidelines recommend that adults aged 16 – 94 engage in at least 150 minutes of moderate aerobic activity, such as walking and cycling, every week. Further information on the guidelines can be found on the NHS website.

Childhood physical activity

The data originates from the Active Lives Children and Young People Survey, collected by Sport England on an annual basis for PHE. Retrieved from here. Data is available for 2017/18 only. Further information can be found on the Active Lives Survey website.

Healthy life expectancy

Life expectancy, healthy life expectancy and disabilityfree life expectancy – at birth and age 65 by sex figures are calculated by the Office for National Statistics. Data are based on the number of deaths registered and mid-year population estimates, aggregated over 3 consecutive years. Figures are not calculated for City of London due to small population numbers. More information can be found here.

Child mental health

Data are from the Mental Health of Children and Young People survey, which was carried out in 1999, 2004 and 2017. Data for all three years is available by type of disorder and by sex. Data by region and by type of disorder is available for 5-19 year olds, but this is only available for 2017. Retrieved from here.

The surveys applied consistent methods to assess for disorders according to International Classification of Disease (ICD-10) criteria. The 2017 survey was funded by the Department of Health and Social Care, commissioned by NHS Digital, and carried out by the National Centre for Social Research, the Office for National Statistics and Youthmind. The data produced by the survey are official statistics. More information can be found on the NHS Digital website.

Adult mental health

The National Study of Health and Wellbeing (also known as Adult Psychiatric Morbidity Survey) runs every 7 years. Since 1993, it has been finding out how the everyday stresses, strains and joys affect the health of people living in England. The latest data published in 2017 was based on the 2014 survey. More information about the study can be found on the NHS Digital website.

Referral to Treatment Waiting Times

Consultant-led Referral to Treatment (RTT) waiting times monitor the length of time from referral through to elective treatment. Monthly RTT waiting data has been published since March 2007. A waiting time starts from the point that a
hospital or service receives a referral letter, of when the first appointment is booked through the NHS e-Referral service. A waiting time ends when a clinician decides no treatment is necessary, a patient decides they don’t wait to be treated, or when treatment begins. The data are national statistics. More information on patient waiting times can be found on the NHS England website and government website.

Delayed Transfers of Care

Delayed Transfers of Care (DTOC) by responsible organisation data are from the Monthly Situation Report, which collects data on the total delayed days during the month for all patients delayed throughout the month. More information can be found on the NHS England website, and on the Kings Fund website.

Air pollution

The London Air Quality Network (LAQN) was established by King’s College London in 1993. The network is operated by the Environmental Research Group at KCL and provides independent scientific measurements and assessment. Data is collected from over 100 continuous monitoring sites in the majority of London’s boroughs. Automatic monitoring equipment in fixed cabins allows to obtain a long history of measurement with the same equipment at the same location. More information can be found on the LAQN website.