3. Results
kidney anomalies
POLAND
Eight hundred and ten children (Germany n = 193, Belgium n = 130, Poland n = 206, and Spain n = 301) underwent a kidney ultrasound at 6 months. A kidney ultrasound was completed at 11 years in 389 children (only children from Poland n = 83 and Spain n = 174). After excluding children with kidney anomalies, 232 children (115 male and 117 female) underwent a kidney ultrasound at both 6 months and 11 years and were included in the analysis (Spain n = 166 and Poland n = 66). The baseline and follow-up characteristics according to feeding group are summarized in The correlation between variables is shown in 