The dataset source, Public Health England, is an executive agency of the Department of Health & Social Care, part of England Government. The source of the primary data about overweight or obese adults and physically inactive adults was from Sport England through Active Lives, which has replaced the Active People Survey. The new survey provides the same indicators but the methodology has changed, both in terms of questions and the mode of completion (telephone to online/postal version). Public Health England has updated the physical activity indicators with Active Lives data to support local monitoring of performance against the government from Sport Strategy and Chief Medical Officer (CMO) recommendations. Physical inactivity is defined as engaging in less than 30 minutes of physical activity per week. The smoking statistics are based on the indicators produced by Public Health England Epidemiology and Surveillance Team (part of Public Health England) and are based on primary data available through the Integrated Household Survey.
For numerator used to calculate the values of the indicator for adults with an excess of weight (overweight or obese) contains adults 19 years old and over, with a BMI (Body Mass Index) greater or equal to 25kg/m2. The denominator values are unweighted counts. All analyses for this indicator have been weighted and age-standardized to be representative of the population of England. The method used to calculate the confidence interval limits for this indicator was by using the 2.5th and 97.5th percentiles derived from 10,000 simulations of excess weight prevalence for each age group within each area and is an approximate 95% confidence interval.
The indicator for physically inactive adults was calculated using as numerator the number of respondents aged 19 years old and over, with valid responses to questions on physical activity, doing less than 30 moderate intensity equivalent (MIE) minutes physical activity per week in bouts of 10 minutes or more in the previous 28 days expressed as a percentage of the total number of respondents aged 19 and over. The denominator values are unweighted counts. All analyses for this indicator have been weighted and age-standardized to be representative of the population of England. The confidence intervals are calculated using the Wilson Score method, the preferred method for calculating confidence intervals for proportions and odds, and which can be also used for rates, as long as the event rate is low (relatively rare events within the population) as the Binomial distribution is a very good approximation to the Poisson distribution when the event rate is low.
The percent of adults smokers was calculated using for numerator the number of persons aged 18 years old and over, who are self-reported smokers in the Integrated Household Survey. The number of respondents has been weighted in order to improve representatives of the sample. The weights take into account survey design and non-response. The denominator is based on the same sample of the population like the numerator. Both, the numerator and denominator, have been weighted to improve representatives. The confidence limits have been calculated using the normal approximation method, which can be used to calculate approximate confidence intervals for a wide variety of indicators. Any indicator value which is calculated as a mean of the observed values can be approximated with a Normal distribution as long as the sample size is sufficiently large.
Working is defined as those that reported their current working status as either working full-time or working part-time. Unemployed includes those that reported being unemployed for less than 12 months or more than 12 months. Inactive is defined as those that reported their current working status as retired, looking after house/children or long-term sick or disabled. The Working Status category excludes those that report their working status as student or other.
Disability is defined as self-reporting of any physical or mental health conditions or illnesses that have lasted or are expected to last 12 months or more, that have a substantial effect on the ability to carry out normal daily activities.
In the case of the socioeconomic status, valid respondents were assigned to one of eight National Statistics Socio-economic classification (NS-SEC) analytic classes. These NS-SEC classes were then grouped to provide four categories: Managerial and professional occupations (NS SEC 1-2); Intermediate occupations (NS SEC 3-5); Routine and manual occupations (NS SEC 6-7) and; Never worked and long term unemployed (NS SEC 8). Respondents classed as full-time student or unclassified (NS SEC 9), and those aged under 16 or over 75 were excluded from the socioeconomic status analysis.