General patient population characteristics and distribution of KD and ARF hospital admissions, per year
| General population | 2008 | 2009 | 2010 | 2011 | 2012 | 2013 | Mean |
| No of patients hospitalised (n, all causes) | 5 287 364 | 5 232 412 | 5 170 695 | 5 193 430 | 5 217 264 | 5 163 969 | 5 210 856 |
| Sex ratio (male, %/female, %) | 47.3/52.7 | 48.1/51.9 | 48.0/52.0 | 47.9/52.1 | 47.7/52.3 | 47.8/52.2 | 47.8/52.2 |
| Age (mean, years) | 59±20 | 59±20 | 60±20 | 60±20 | 60±20 | 61±20 | 60±20 |
| No of patients hospitalised (for more than 24 hours for KD, n, % general population) | 102 420 (1.9) | 106 853 (2.0) | 109 931 (2.1) | 113 492 (2.2) | 118 000 (2.3) | 122 515 (2.4) | 112 202 (2.2) |
| Sex ratio (male, %/female, %) | 53.0/47.0 | 52.9/47.1 | 52.7/47.3 | 52.7/47.3 | 52.6/47.4 | 52.4/47.6 | 52.7/47.3 |
| Age (mean, years) | 64±18 | 64±18 | 65±18 | 65±18 | 65±18 | 66±18 | 65±18 |
| No of patients hospitalised (for more than 24 hours for ARF, n, % of general population) | 15 993 (0.3) | 17 473 (0.3) | 16 567 (0.3) | 16 491 (0.3) | 17 082 (0.3) | 17 478 (0.3) | 16 847 (0.3) |
| Sex ratio (male, %/female, %) | 59.2/40.8 | 58.5/41.5 | 59.6/40.4 | 59.2/40.8 | 59.4/40.6 | 59.6/40.4 | 59.3/40.7 |
| Age (mean, years) | 71±15 | 71±15 | 71±15 | 71±15 | 71±14 | 71±15 | 71±15 |
The proportion of patients hospitalised for KD rose progressively from 1.9% in 2008 to 2.4% in 2013: Cochran-Armitage test, p<0.0001.
ARF, acute renal failure; KD, kidney disease.