Table 1. Demographics of patient cohort.
| Variable | Category/Statistics | Frequency (%)/Values |
|---|---|---|
| Number of patients | 2287 | |
| Total number of measurements | 48,338 | |
| Location where blood sample taken | Inpatient | 5477 (11.3%) |
| Outpatient | 42,861 (88.7%) | |
| Gender | Female | 873 (38.2%) |
| Male | 1414 (61.8%) | |
| Ethnicity | Caucasian | 2200 (96.2%) |
| Other | 87 (3.8%) | |
| Base hospital (at study entry) | Salford Royal Foundation Trust | 681 (29.8%) |
| Other | 1606 (70.2%) | |
| Smoking | Never smoked | 749 (32.7%) |
| Ex/current | 1538 (67.3%) | |
| Alcohol consumption | No | 1191 (52.1%) |
| Yes (any intake) | 1096 (47.9%) | |
| Diabetes | No | 1565 (68.4%) |
| Type I or II | 722 (31.6%) | |
| Previous major cardiovascular events | No | 1832 (80.1%) |
| Yes | 455 (19.9%) | |
| Primary renal disease | Diabetes | 375 (16.4%) |
| Glomerulonephritis | 383 (16.8%) | |
| Immune/vasculitis | 64 (2.8%) | |
| Polycystic | 131 (5.7%) | |
| Pyelonephritis | 137 (6.0%) | |
| Vascular | 635 (27.8%) | |
| Other | 562 (24.6%) | |
| Baseline age (years) | Min | 20 |
| 50th quantile (Median) | 66.8 | |
| Max | 94.3 | |
| Number of repeated measurements | Min | 1 |
| 50th quantile (Median) | 13 | |
| Max | 280 | |
| Total follow-up (years elapsed between first and last measurements) | Min | 0 |
| 50th quantile (Median) | 2.6 | |
| Max | 10.9 | |
| Baseline eGFR | Min | 2.6 |
| 50th quantile (Median) | 28.4 | |
| Max | 116.5 | |
| Censored | 1360 (59.5%) | |
| Renal replacement therapy | 356 (15.6%) | |
| Death (before RRT) | 571 (30.0%) |