Impact of adjustment for all case-mix variables on practice level mean scores, and practice rankings
| General practice patient survey question | Percentage of practice score variance due to case-mix adjustment† (column 1) | Percentage reranking among practices‡ (column 2) | Practices losing 10+ percentile ranks (%) (column 3) | Practices gaining 10+ percentile ranks (%) (column 4) | Practices losing 20+ percentile ranks (%) (column 5) | Practices gaining 20+ percentile ranks (%) (column 6) |
| Helpfulness of receptionists | ||||||
| Q4* | 5.0 | 6.4 | 3.3 | 6.1 | 0.1 | 1.6 |
| Getting through on the phone | ||||||
| Q5a | 0.7 | 2.4 | 0.0 | 0.4 | 0.0 | 0.0 |
| Ability to get urgent appointment | ||||||
| Q7 | 2.0 | 4.8 | 0.7 | 3.4 | 0.0 | 0.3 |
| Ability to book ahead | ||||||
| Q10 | 1.7 | 4.2 | 0.1 | 2.4 | 0.0 | 0.1 |
| Evaluation of surgery waiting time | ||||||
| Q14 | 4.8 | 6.6 | 2.8 | 6.8 | 0.0 | 1.8 |
| Seeing the doctor you prefer | ||||||
| Q16 | 6.3 | 7.4 | 3.9 | 9.2 | 0.0 | 2.5 |
| Satisfaction with opening hours | ||||||
| Q17 | 5.9 | 7.7 | 7.6 | 8.0 | 0.4 | 1.5 |
| Doctor patient communication | ||||||
| Q20 | 5.3 | 7.0 | 4.5 | 7.1 | 0.1 | 2.0 |
| Confidence and trust in doctor | ||||||
| Q21 | 5.3 | 7.3 | 5.4 | 7.6 | 0.2 | 1.8 |
| Nurse patient communication | ||||||
| Q24 | 7.2 | 7.7 | 5.8 | 8.2 | 0.1 | 2.8 |
| Overall satisfaction | ||||||
| Q25 | 6.2 | 7.2 | 4.6 | 7.5 | 0.2 | 2.0 |
| Did doctor or nurse agree a care plan? | ||||||
| Q28 | 12.3 | 11.1 | 15.1 | 14.7 | 1.8 | 4.9 |
| Has care plan helped improve care? | ||||||
| Q29 | 10.8 | 10.1 | 12.3 | 12.5 | 1.5 | 3.7 |
↵* General Practice Patient Survey question number.
↵† Percentage of variation in practice-level means due to case-mix adjustment calculated as 1−r2 where r is the Pearson's correlation coefficient between adjusted and unadjusted practice-level means.
↵‡ Calculated ((1−τ))/2)×100 where τ is Kendall's tau correlation coefficient between the adjusted practice level means and unadjusted practice level means with shrinkage.