Table 2.
Characteristics of the study population at baseline (n = 207)
| n (%) or mean (SD) | |
|---|---|
| Sex, male | 124 (59.9) |
| Age, years | 65.5 (13.8) |
| Ethno-cultural group$, Dutch | 176 (85.0) |
| Educational level# | |
| Low | 85 (41.0) |
| Middle | 49 (23.7) |
| High | 73 (35.3) |
| Primary kidney disease | |
| Glomerulonephritis | 34 (16.6) |
| Pyelonephritis | 7 (3.4) |
| Polycystic kidney disease | 16 (7.8) |
| Other congenital/hereditary kidney diseases | 15 (7.3) |
| Hypertension/renal vascular disease | 46 (22.5) |
| Diabetes mellitus | 14 (6.8) |
| Miscellaneous | 63 (30.7) |
| Unknown | 10 (4.9) |
| Kidney function, eGFR (ml/min.1.73 m2) | 21.4 (6.7) |
| KRT in medical history£, yes | 35 (17.0) |
| BMI, kg/m2 | 26.8 (5.2) |
| Smoking | |
| Yes | 25 (13.2) |
| No, stopped | 94 (49.7) |
| No, never smoked | 70 (37.0) |
| Comorbidities | |
| Hypertension, yes | 164 (79.2) |
| Diabetes mellitus, yes | 62 (30.0) |
| Cardiovascular disease, yes | 53 (25.6) |
| Lung disease, yes | 30 (14.5) |
| Liver disease, yes | 11 ( 5.3) |
| Malignancy, yes | 50 (24.2) |
$ Self-reported ethno-cultural group: “What ethnic group do you consider yourself to belong to?“
# Educational level according to International Standard Classification of Education (ISCED) levels 2011, classified as low: primary, lower secondary or lower vocational education; middle: upper secondary or upper vocational education; high: tertiary education (college/university)
£ KRT in medical history includes patients who have undergone (temporary) dialysis treatment or had received a kidney transplant in the past. At study inclusion, all patients had an eGFR < 30 and did not require dialysis treatment, in accordance with inclusion criteria
Missing values for population at baseline: primary kidney disease: n = 2 (1.0%); KRT in medical history: n = 1 (0.5%); BMI: n = 11 (5.3%); smoking: n = 18 (8.7%)
Abbreviations: BMI = body mass index; eGFR = estimated glomerular filtration rate; KRT = kidney replacement therapy