Table 2.
Baseline characteristics for each dataset
| Grampian 2003 | Grampian 2007 | Grampian 2012 | Swansea 2007 | Salford 2012 | |
| Patient total (%) | Patient total (%) | Patient total (%) | Patient total (%) | Patient total (%) | |
| Adult resident population (aged ≥15) | 438 332 | 458 900 | 482 444 | 415 500 | 193 882 |
| Population ascertainment of renal impairment (eGFR <60 mL/min/1.73 m2) in index year | |||||
| No tests during index year | 311 922 (71.2)* | 303 673 (66.2) | 301 992 (62.6) | 253 531 (61.0) | 116 977 (60.3) |
| eGFR ≥60† | 101 595 (23.2) | 120 854 (26.3) | 158 736 (32.9) | 129 959 (31.3) | 66 890 (34.5) |
| eGFR <60† | 24 805 (5.7) | 34 373 (11.3) | 21 716 (4.5) | 32 010 (7.7) | 10 015 (5.2) |
| Sufficiency of tests to enable AKI detection | |||||
| People with no tests during index year | 311 922 (71.2) | 303 673 (66.2) | 301 992 (62.6) | 253 531 (61.0) | 116 977 (60.3) |
| People with insufficient tests | 52 602 (12.0) | 57 788 (12.6) | 69 239 (14.4) | 59 839 (14.4) | 31 467 (16.2) |
| People with ≥2 tests within 365 days | 73 808 (16.8) | 97 439 (21.2) | 111 213 (23.1) | 102 130 (24.6) | 45 438 (23.4) |
| Characteristics of people with ≥2 tests within 365 days | |||||
| Proportion women | 40 413 (54.8) | 53 061 (54.5) | 60 330 (54.2) | 55 685 (54.5) | 24 723 (54.4) |
| Median age (IQR) | 63 (48–74) | 63 (50–75) | 63 (49–74) | 64 (51–75) | 63 (49–74) |
| eGFR <60† | 18 573 (25.2)‡ | 28 274 (29.0) | 18 679 (20.2) | 25 952 (25.4) | 8541 (18.8) |
*Expressed as a percentage of total residents unless specified otherwise.
†First eGFR in index year (mL/min/1.73 m2).
‡Expressed as a percentage of people with ≥2 tests within 365 days.
AKI, acute kidney injury; eGFR, estimated glomerular filtration rate.