Sensitivity analysis of adjusted associations between CXR rates with population and general practice characteristics for 2018, excluding practices that performed <3 CXRs in 2018 (n = 127, 1.9%)a
| Characteristic | Rate ratiosb (95% CI) | P-value |
|---|---|---|
| Practice population characteristics | ||
| Percentage patients male | 0.96 (0.94 to 0.98) | <0.001 |
| Percentage of patients aged ≥65 years | 1.26 (1.21 to 1.30) | <0.001 |
| Percentage of patients who are smokers | 1.11 (1.07 to 1.14) | <0.001 |
| Percentage of patients on chronic obstructive pulmonary disease register | 1.16 (1.12 to 1.20) | <0.001 |
| Percentage of patients on heart failure register | 1.07 (1.04 to 1.09) | <0.001 |
| Ethnicity category, % | ||
| Mixed/multiple ethnic groups | 0.99 (0.95 to 1.03) | 0.62 |
| Asian/Asian British | 1.14 (1.11 to 1.17) | <0.001 |
| Black/African/Caribbean/Black British | 0.98 (0.95 to 1.02) | 0.311 |
| Other ethnic groups | 0.98 (0.96 to 1.01) | 0.236 |
| Deprivation fifthc | ||
| F2 | 0.95 (0.91 to 0.99) | 0.020 |
| F3 | 0.92 (0.88 to 0.97) | 0.001 |
| F4 | 0.91 (0.86 to 0.97) | 0.002 |
| F5 | 0.93 (0.87 to 1.00) | 0.054 |
| General practice characteristics | ||
| Patients per full-time equivalent GP | 1.00 (0.99 to 1.02) | 0.635 |
| Percentage of GPs who are male | 0.98 (0.97 to 1.00) | 0.093 |
| Percentage of GPs who are UK qualified | 0.99 (0.99 to 1.01) | 0.251 |
| GP age, mean | 0.99 (0.97 to 1.01) | 0.318 |
| Practice list size | 0.93 (0.90 to 0.94) | <0.001 |
| Single-handed practice | 0.97 (0.92 to 1.03) | 0.381 |
| Practice involved in postgraduate GP training | 1.06 (1.02 to 1.09) | 0.001 |
| Rural location | 1.03 (0.99 to 1.06) | 0.137 |
| Percentage who gave highest rating for general practice survey for: | ||
| Helpfulness of reception staff (access) | 0.95 (0.92 to 0.98) | 0.001 |
| Ability to book appointment (access) | 0.95 (0.93 to 0.98) | <0.001 |
| Ability to see preferred GP (continuity) | 1.06 (1.03 to 1.09) | <0.001 |
| Healthcare professional communication skills | 1.03 (1.00 to 1.06) | 0.052 |
↵a The characteristics of these practices are outlined in Supplementary Table S3. The rate or odds ratios correspond to the change in the rate resulting from moving from the 25th to the 75th centile of the exposure variable (practice team or practice population characteristic) of interest. Bold fonts used for rate ratio values ≥1.04 or ≤0.96 where P <0.01.
↵b For categorical values these are odds ratios.
↵c Derived from Index of Multiple Deprivation practice scores for 2015. F1 = least deprived; F5 = most deprived. CXR = chest X-ray.