Table 5: Absolute differences in percentage of population matched to a UPRN, adjusted complete case analysis prevalence ratios and 99% CIs with respect to reference category by demographic, GP registration and organisational characteristics.
| Number n | Absolute difference relative to reference group (%) | Prevalence ratio | 99% CI lower | 99% CI upper | |
| Patient age at registration (years) | |||||
| <1 | 30,029 | Ref | |||
| 1–14 | 93,868 | -0.13 | 0.999 | 0.997 | 1 |
| 15–29 | 485,945 | -1.46 | 0.986 | 0.982 | 0.989 |
| 30–64 | 811,582 | -0.8 | 0.992 | 0.990 | 0.994 |
| 65–84 | 52,385 | -0.55 | 0.995 | 0.992 | 0.997 |
| 85 and over | 4,334 | -1.94 | 0.981 | 0.966 | 0.995 |
| Ethnic background | |||||
| British | 375,405 | Ref | |||
| African | 100,142 | 0 | 1 | 0.998 | 1.002 |
| Any other Asian background | 60,999 | -0.2 | 0.998 | 0.994 | 1.002 |
| Any other Black background | 43,764 | 0.28 | 1.003 | 1.000 | 1.005 |
| Any other White background | 336,182 | -0.31 | 0.997 | 0.995 | 0.999 |
| Any other ethnic group | 52,610 | -0.31 | 0.997 | 0.993 | 1.001 |
| Any other Mixed background | 14,944 | -0.8 | 0.992 | 0.988 | 0.996 |
| Bangladeshi | 145,379 | 0.55 | 1.006 | 1.003 | 1.009 |
| Caribbean | 47,653 | 0.43 | 1.004 | 1.002 | 1.006 |
| Chinese | 21,819 | -3.26 | 0.968 | 0.946 | 0.989 |
| Indian | 120,431 | -0.11 | 0.999 | 0.994 | 1.003 |
| Irish | 12,945 | -0.22 | 0.998 | 0.994 | 1.002 |
| Not stated | 25,826 | -0.79 | 0.993 | 0.987 | 0.999 |
| Pakistani | 93,146 | 0.26 | 1.003 | 1 | 1.005 |
| White and Asian | 4,905 | -0.51 | 0.995 | 0.990 | 1 |
| White and Black African | 9,918 | -0.62 | 0.994 | 0.986 | 1.002 |
| White and Black Caribbean | 12,075 | -0.42 | 0.996 | 0.991 | 1.001 |
| Sex | |||||
| Female | 736,398 | Ref | |||
| Male | 741,745 | -0.19 | 0.998 | 0.997 | 0.999 |
| IMD 2019 quintile | |||||
| 1 (most deprived) | 367,429 | Ref | |||
| 2 | 666,104 | 0.07 | 1.001 | 0.998 | 1.003 |
| 3 | 268,097 | 0.12 | 1.001 | 0.997 | 1.005 |
| 4 | 116,122 | -0.25 | 0.997 | 0.989 | 1.005 |
| 5 (least deprived) | 60,391 | 0.07 | 1.001 | 0.995 | 1.006 |
| GP registration duration (quartiles) | |||||
| 1 (shortest) | 386,610 | Ref | |||
| 2 | 388,014 | 0.66 | 1.007 | 1.004 | 1.009 |
| 3 | 381,225 | 1.38 | 1.014 | 1.01 | 1.018 |
| 4 (longest) | 322,294 | 1.77 | 1.018 | 1.014 | 1.022 |
| Number of GP registrations in preceding 12 months | |||||
| 1 | 1,336,709 | Ref | |||
| 2 | 126,645 | 0.1 | 1.001 | 0.999 | 1.003 |
| 3 or more | 14,789 | -0.29 | 0.997 | 0.992 | 1.002 |
| Number of address changes in preceding 12 months | |||||
| 1 | 1,083,883 | Ref | |||
| 2 | 305,838 | -0.69 | 0.993 | 0.99 | 0.996 |
| 3 or more | 88,422 | -3.12 | 0.969 | 0.957 | 0.981 |
| GP system | |||||
| EMIS | 1,370,370 | Ref | |||
| SystmOne | 77,354 | -2.63 | 0.973 | 0.967 | 0.98 |
| VISION | 30,419 | 0.52 | 1.005 | 0.999 | 1.012 |
| Clinical Commissioning Group | |||||
| Newham | 306,438 | Ref | |||
| Barking & Dagenham | 122,432 | -0.12 | 0.999 | 0.993 | 1.004 |
| City & Hackney | 232,840 | -0.88 | 0.991 | 0.986 | 0.996 |
| Havering | 135,262 | 0.22 | 1.002 | 0.998 | 1.006 |
| Redbridge | 212,088 | -0.36 | 0.996 | 0.990 | 1.003 |
| Tower Hamlets | 244,643 | -1.35 | 0.986 | 0.977 | 0.995 |
| Waltham Forest | 224,440 | -0.65 | 0.993 | 0.987 | 1 |
Complete case analysis; N = 1,478,143.
IMD = Index of Multiple Deprivation.
Quartile definitions for GP registration duration: Quartile 1 (shortest): 0–32 months; Quartile 2: 33–77 months; Quartile 3: 78–183 months; Quartile 4 (longest) > 184 months.
EMIS: Egton Medical Information Systems.
Reference groups and values with an absolute match rate difference to the reference group of >1% are in bold.