Table 1.

Practice-level variables and practice characteristics used in analysis. All data that does not pertain to 2018 is indicated by a footnote

Variables and characteristicsMedian (IQR)10th–90th centilesMedian (IQR) for general practices within 0–10th centiles of CXR rate (<16.5 per 1000 patients) (n= 667)Median (IQR) for general practices within 90–100th centiles of CXR rate > (51.2 per 1000 patients) (n= 668)
CXRs per 1000 patients33.8 (25.5–42.6)16.5–51.2
Total CXRs per practicea250 (135–395)70–56035 (5–85)368 (255–570)
Practice population characteristics
Percentage of patients who are male49.7 (48.9–50.8)48.2–52.750.2 (49.1–52.2)49.5 (48.6–50.1)
Percentage of patients aged ≥65 years17.6 (12.4–21.9)8.2–26.011.4 (6.7–18.7)21.1 (17.3–25.4)
Percentage of patients who are smokers16.5 (12.9–20.6)10.4–24.116.8 (13.2–20.5)17.0 (13.5–21.1)
Percentage of patients on practice chronic obstructive pulmonary disease register1.9 (1.3–2.5)0.9–3.21.4 (0.7–2.1)2.7 (2.2–3.3)
Percentage of patients on heart failure register0.9 (0.6–1.7)0.4–1.50.6 (0.4–0.9)1.8 (0.9–1.5)
Ethnicity category estimates, %b
  White92.4 (75.3–97.3)50.6–98.280.8 (58.6–96.3)96.8 (92.1–98.1)
  Mixed/multiple ethnic groups1.7 (1.0–3.5)0.7–5.23.2 (1.0–4.9)1.1 (0.8–1.7)
  Asian/Asian British3.6 (1.2–11.0)0.7–25.68.1 (1.9–15.5)1.4 (0.8–3.8)
  Black/African/Caribbean/Black British1.0 (0.3–4.9)0.2–12.03.7 (0.5–11.4)0.4 (0.2–1.3)
  Other ethnic groups0.4 (0.2–1.5)0.1–3.51.4 (0.2–3.1)0.2 (0.1–0.5)
General practice characteristics
Patients per full-time equivalent GP, n1881 (1440–2459)1157–34042110 (1630–2829)1629 (1290–2196)
Percentage GPs who are male51.1 (36.2–68.7)21.3–97.353.0 (36.8–75.8)53.4 (38.1–70.4)
Percentage GPs who are UK qualified75.0 (50.0–100.0)0–10069.6 (33.3–92.9)75.0 (50.0–100.0)
GP age, years, mean46 (43–50)40–5647 (43–53)45 (42–50)
Practice list size, n7622 (4869–11 141)3258–14 7826829 (4486–11 008)6345 (4274–9595)
Percentage who gave highest rating for general practice survey for:
  Helpfulness of reception staff48.5 (39.7–58.2)32.7–67.149.7 (41.2–58.8)51.5 (42.1–62.1)
  Ability to see preferred GP (continuity)54.7 (48.8–60.8)43.5–66.554.3 (47.8–60.4)56.9 (51.2–63.1)
  Ability to book appointment (access)25.0 (17.4–34.7)13.0–46.427.9 (20.1–38.0)25.1 (16.6–36.5)
  Healthcare professional communication skills78.4 (72.3–84.0)66.1–88.378.4 (71.4–83.9)79.6 (73.6–85.6)
Categorical variablesn (%)cn (%)cn (%)c
Deprivation fifthd
  F11360 (20.4)75 (11.2)83 (12.4)
  F21357 (20.3)106 (15.9)148 (22.2)
  F31337 (20.0)151 (22.6)133 (19.9)
  F41444 (21.6)226 (33.9)154 (23.1)
  F51177 (17.6)109 (16.3)150 (22.5)
Single-handed status
  Yes410 (6.1)60 (9.0)39 (5.8)
  No6265 (93.9)607 (91.0)629 (94.2)
Practice location
  Urban5695 (85.3)551 (82.6)569 (85.2)
  Rural980 (14.7)116 (17.4)99 (14.8)
Practice involved in postgraduate GP training
  Yes2486 (37.2)184 (27.6)277 (41.5)
  No4189 (62.8)483 (72.4)391 (58.5)
  • a In order to maintain patient anonymity, Diagnostic Imaging Dataset rounds CXR counts for each practice to nearest 5 and counts of <3 are suppressed. In this study ‘2’ was substituted for practices with counts of <3.

  • b The ethnic composition of practice populations estimated by applying 2011 census data to the 2015 practice populations. These estimates were obtained from Public Health England.

  • c As a result of rounding, not all percentages add precisely to 100.

  • d Derived from Index of Multiple Deprivation practice scores for 2015. F1 = least deprived; F5 = most deprived. CXR = chest X-ray. IQR = interquartile range.