Table 1.
Subjects characteristics (n = 4,305)
| Age at measurements, years | 6.0 (5.7–8.0) |
| Gender, female, % | 48.3 |
| Ethnicity, % | |
| Dutch or European | 65.1 |
| Non-European | 34.9 |
| Height, m | 119.7 (6.0) |
| SD score*, mean (SD) | –0.2 (1.0) |
| Weight, kg | 23.4 (4.2) |
| SD score*, mean (SD) | 0.1 (1.0) |
| Body mass index, kg/m2 | 16.2 (1.8) |
| SD score*, mean (SD) | 0.3 (0.9) |
| Body surface area, m2 | 0.88 (0.09) |
| Fat mass percentage, % | 24.7 (5.6) |
| Lean mass percentage, % | 71.7 (5.4) |
| eGFRcreat, mL/min/1.73 m2 | 118.9 (15.9) |
| eGFRcystC, mL/min/1.73 m2 | 101.6 (11.2) |
Values are percentages for categorical variables, means (SD) for continuous variables with a normal distribution, or medians (95% range) for continuous variables with a skewed distribution. * The SD scores were obtained using Dutch reference growth curves (Growth Analyzer 3.0, Dutch Growth Research Foundation, Rotterdam, The Netherlands). eGFRcreat, estimated glomerular filtration rate calculated based on creatinine blood concentrations; eGFRcreat = 36.5 * (height [cm]/serum creatinine [µmol/L]); eGFRcystC, estimated glomerular filtration rate calculated based on cystatin C blood concentrations; eGFRcystC = 75.94/(cysC [mg/L]1.17).