The inverse care law in general practice

Differences in access and quality of general practice are complex and vary over time., In this section, we summarise recent evidence on differences in general practice services related to social disadvantage in England. We focus on the three components of the inverse care law: care need, supply, and quality.

Need

Need for health care varies within the population and is shaped by a range of factors. These include social and economic conditions, race and ethnicity, commercial influences, access to health care, and more.,,, Estimates vary, but most studies suggest that wider social, economic, and other factors play a greater role in shaping health than health care.,

The distribution of health in the population is socially patterned. People who live in more deprived areas are more likely to be exposed to things that contribute to poor health (such as low income or poor housing), and are less likely to be exposed to things that can keep people healthy (such as high-quality employment and housing). There is a 12-year gap in healthy life expectancy between the richest and poorest areas of England.

These factors translate into greater health care needs in more deprived areas. The prevalence of multimorbidity, for instance, is higher in more deprived areas, and multimorbidity is strongly associated with health care utilisation.,,

They also mean greater use of general practice services. General practice consultation rates are significantly higher in more deprived areas. Analysis of data from 2013/14 found that patients living in the most deprived fifth of areas consulted 17% more often than those in the least deprived fifth. And recent analysis of data from the Clinical Practice Research Datalink shows that in 2020, patients living in the wealthiest 10% of areas had an average of four consultations per year, compared with five in the poorest 10%. Patients with multiple health conditions in deprived areas also receive less time per GP consultation.

Accurately assessing ‘need’ for general practice is difficult. Some health care needs are unmet (if people do not access care), and others only partially met (if care is limited). Measures that describe use of services – such as consultation rates or appointment numbers – are themselves affected by many factors, including patient behaviour and the availability of services. Evidence suggests that people from poorer backgrounds tend to consume fewer preventive services than wealthier patients, and present to health care providers at later stages of disease progression. People living in deprived areas may lack awareness of some services, fear being blamed by health care staff, or face financial barriers to accessing care.

Supply

Health care supply describes the quantity of medical services available to meet health care needs. In general practice, this includes the number and type of staff, the location, size and how modern GP surgeries are, and the funding available to pay for services. The supply of GP services in England has varied over time.,, The supply of general practice in England is currently inversely correlated with population need.

Funding

GP practices in more socioeconomically deprived areas receive similar funding per registered patient to those serving less deprived areas. But after adjusting for the increased workload associated with greater health needs for people in poorer areas, GP surgeries in deprived areas are worse off. Analysis of data from between 2015/16 and 2018/19 shows that practices serving more deprived areas received around 7% less funding per need-adjusted patient than those in the most affluent areas (Figure 1). This trend has been consistent since 2015 and there is no sign of inequities in funding narrowing.

Source: Data are from NHS Digital, ONS, and MHCLG quintiles aggregated from LSOA 2011 neighbourhoods

Workforce

More deprived areas in England currently have fewer GPs per patient than less deprived areas. After accounting for differences in need, a GP working in a practice serving the most deprived patients in 2019 was, on average, responsible for almost 10% more patients than a GP in the most affluent areas. Inequities in GP supply widened between 2015 and 2020. By 2020, there were 1.4 fewer full-time equivalent GPs per 10,000 patients in the most deprived areas compared with the most affluent areas.

This has not always been the case. Between 2004/05 and 2013/14, the number of GPs working in more deprived areas rose. Previous analyses – examining periods before 2015 – had primarily found a ‘disproportionate care law’ in relation to deprivation and GP supply: there were more GPs in areas of high deprivation, but not relative to population need.

The skill mix in general practice has also changed over time, with other primary care staff, such as pharmacists, delivering care. While there are currently fewer GPs, total direct patient care staff, and paramedics per 10,000 patients in more deprived areas, there are more physician associates and pharmacists. In a reverse of the trend seen for GPs, practices in more deprived areas tend to have more nurses, which may imply that nurses are being substituted for doctors in these areas.

The demands made on GPs working in deprived areas are different to those working in more affluent areas – for instance, because of the complexity of patients’ needs. GP turnover – the proportion of staff who leave a practice in a given time period – is also higher in areas of high deprivation. This could affect quality in different ways. High turnover may undermine continuity of care, affect recruitment and retention of GPs, and negatively impact on the ability to deliver care., High GP turnover can also bring additional costs.

Quality

The ability of health care services to meet people’s needs depends on their quality – not just their quantity. There is no single definition of quality in general practice.,,, But a range of indicators and frameworks are used to measure quality of general practice in the NHS. They include Care Quality Commission (CQC) ratings, quality and outcomes framework (QoF) scores, GP patient satisfaction surveys, and indicators related to specific conditions.

QoF was introduced in 2004. At first, practices in more affluent areas of England had higher QoF scores than practices in more deprived areas, but this gap in performance narrowed between 2004 and 2007., By 2011, Dixon et al concluded that differences in performance between practices in deprived and affluent areas had ‘all but disappeared’. But analysis of data from 2015 to 2019 found that practices in the most deprived areas averaged the lowest number of QoF points, and those in the most affluent areas scored the highest. Higher QoF scores translate to larger average payments.

The CQC has been inspecting general practices in England since 2014. Most practices are rated as ‘good’, but analysis of the first complete round of inspections showed that practices in more deprived areas were more likely to receive lower ratings of ‘inadequate’ or ‘requires improvement’. GP patient survey results from 2021 show that people from the most deprived areas were more likely to report a poor overall experience and were less likely to report that their needs had been met. This pattern persists over recent years. Between 2015 and 2021, practices serving the most deprived areas received the lowest overall patient satisfaction scores, while practices in the most affluent areas received the highest (Figure 2).

Source: NHS, GP Patient Survey and MHCLG, English indices of deprivation based on LSOA 2011 neighbourhoods

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