Table 1.

Characteristics of practicesa and registered populations, by type of working at scaleb

Not working at scaleWorking at scaleUniversity practicesNo working at scale dataAll practices
Non-core general practice onlycCore general practiced
Number of practices, n2827369321084247162
Rurality of practice
  Rural, %
  OR versus not working at scale, 95% CI0.6 (0.5 to 0.7)0.5 (0.3 to 0.7)
Level of deprivation
  Median IMD scoree 201520.622.930.221.523.022.2
  Difference versus not working at scale, 95% CI1.9 (1.0 to 2.7)5.9 (3.5 to 8.4)
Characteristics of practice population
  Mean aged <5 years, %
  Difference versus not working at scale, % (95% CI)0.2 (0.1 to 0.3)0.6 (0.4 to 0.8)
  Mean aged >75 years, %
  Difference versus not working at scale, % (95% CI)−0.9 (−0.8 to −1.1)−1.7 (−1.3 to −2.2)
  Mean longstanding illness, %54.553.052.341.553.653.6
  Difference versus not working at scale, % (95% CI)−1.5 (−1.1 to −2.0)−2.3 (−1.2 to −3.4)
  • a Practices in existence in February 2018, except practices with <1000 registered patients.

  • b Working at scale defined as working to serve populations of >30 000 patients, either as single practices or in collaboration with other practices.

  • c Services beyond the core general practice contract, for example, extended access out of hours, and services normally delivered in secondary care.

  • d Large practices, superpartnerships, and multisite organisations, working to deliver core general practice at scale. The core general practice contract requires practices to manage patients who are acutely ill, chronically ill, or terminally ill, during office hours.

  • e IMD 2015 of lower layer super-output area of practice postcode. IMD = Index of Multiple Deprivation. OR = odds ratio.