Baseline characteristics of participants in the AQuAH-D cohort and of Japan’s dialysis population
| AQuAH-D cohort | JSDT Renal Data Registry (2018)* | |||
| No of patients | 2895 | 339 841 | ||
| Age (years) | 68.3 | (12.2) | 68.8 | (12.5) |
| Sex, female | 1019 | 35.2% | – | 34.6% |
| Cause of kidney failure | ||||
| Diabetic nephropathy | 1083 | 37.4% | 127 745 | 39.0% |
| Glomerulonephritis | 823 | 28.4% | 87 598 | 26.8% |
| Nephrosclerosis | 347 | 12.0% | 35 495 | 10.8% |
| Other diseases | 642 | 22.2% | – | – |
| Duration of dialysis (years) | 5.4 | (2.0, 11.2) | – | – |
| 8.3 | (9.1) | 7.3 | (7.7) | |
| Body mass index (kg/m2) | 22.2 | (4.1) | – | – |
| Type of vascular access | ||||
| Arteriovenous fistula | 2532 | 87.6% | – | – |
| Arteriovenous graft | 224 | 7.7% | – | – |
| Others | 135 | 4.7% | – | – |
| Comorbidity | ||||
| Cardiovascular disease | 1505 | 52.0% | – | – |
| Diabetes mellitus | 1297 | 44.8% | – | – |
| Lung disease | 178 | 6.1% | – | – |
| Liver disease | 219 | 7.6% | – | – |
| Malignancy | 499 | 17.2% | – | – |
| Haemodialysis prescription | ||||
| Type of dialysis treatment | ||||
| Haemodialysis | 1433 | 49.5% | 177 718 | 57.6% |
| Haemodiafiltration | 1285 | 44.3% | 119 959 | 38.9% |
| Missing | 177 | 6.1% | ||
| Single pool Kt/V† | 1.62 | (0.36) | – | – |
| Laboratory data | ||||
| Haemoglobin (g/L) | 112 | (12) | – | – |
| Serum albumin (g/dL) | 3.6 | (0.4) | – | – |
| Serum phosphorus (mEq/L) | 5.3 | (1.4) | – | – |
| Corrected serum calcium‡ (mg/dL) | 9.1 | (0.6) | – | – |
Continuous variables are described by the mean (SD) or the median (IQR), and categorical variables are described by the number and percentage.
*Results of a survey carried out by the Japanese Society for Dialysis Therapy, in December 2018.5 The JSDT registry includes about 9000 patients on peritoneal dialysis. Percentages were calculated among participants without missing data.
†Single pool Kt/V values were calculated using the equation by Daugirdas.32
‡Serum calcium values were corrected for albumin concentration using a modified version of Payne’s formula.33
AQuAH-D, Alliance for Quality Assessment in Healthcare-Dialysis; JSDT, Japanese Society for Dialysis Therapy.