- CCG
- CCG or clinical commisioning groups are the organisations that deliver health services in the NHS.
- IMD
- IMD is the index of multiple deprivation 2015 normalised rank. Rank 0 represents the least deprived neighbourhood (LSOA) and rank 1 represents the most deprived neighbourhood in the country.
- Population
- Population is the ONS mid-year population at LSOA level attributed to CCGs.
- Standardised rate
- Standardised rate is the rate of unplanned hospitalisation for chronic ambulatory care sensitive conditions over the year per 100,000 of population indirectly standardised for age and sex.
- AGI
- The AGI (Absolute Gradient Index) is a tool that allows us to measure socioeconomic
inequalities within CCGs
and compare socioeconomic inequalities
between CCGs.
It describes the difference in a particular outcome
(for example the rate of emergency hospital admissions) that would
be observed between the richest and poorest
neighbourhoods
in the country if the whole country were as unequal as that
CCG.
The greater the value of the AGI the higher the inequality within the
CCG.

To calculate the AGI we first calculate the outcome of interest for each neighbourhood in the country (for example the rate of emergency hospital admissions per 100,000 population). The calculated outcome may need to be standardised to allow us to compare neighbourhoods with different population age and sex structures. We then rank all the neighbourhoods on a zero to one scale based on the index of multiple deprivation rank with the richest (least deprived) neighbourhood being ranked zero and the poorest (most deprived) neighbourhood being ranked one. Next we select all the neighbourhoods in the CCG for which we want to calculate the AGI and plot the outcome for each neighbourhood against the index of multiple deprivation rank. Finally we draw a line of best fit through the points we have plotted - when fitting our line we give those neighbourhoods with larger populations more weight than those neighbourhoods with smaller populations. The AGI is the gradient of this line. The steeper the line the greater the difference between the richest and poorest neighbourhoods and hence the greater the inequality and the larger the AGI value. - RGI
- The RGI (Relative Gradient Index) is a relative inequality measure derived from the AGI. It is calculated by dividing the AGI by the rate of the outcome for the area at the midpoint of the deprivation distribution. Hence it expresses the inequality as a proportion of the median outcome rate.
- Similar CCGs
- For each
CCG a group of 10 CCGs
most similar to that CCG is identified. These form the
natural comparator group for the CCG.

The similar CCG group members are selected based on how closely matched they are on the following criteria: IMD (deprivation) score, IMD health domain score, total registered population, % of population 0-4, % of population 5-14, % of population 15-24, % of population 75+, ratio of registered population to ONS estimates ("list inflation"), population density, slope variation in population density, % of population black ethnic groups, % of population Asian ethnic groups. Further details can be found here.

The scatter plot shows LSOAs within CCGs with the size of the point representing the population that the LSOA contributes to the CCG. The caterpillar plot show CCG AGI values and their 95% confidence intervals with the average across all CCGs plotted represented by the red dashed line

Contains National Statistics data © Crown copyright and database right 2016. Contains OS data © Crown copyright and database right 2016. Data licensed under the Open Government Licence v3.0