The incidence of the nephrotic syndrome in childhood in Germany.

BACKGROUND: The incidence of childhood nephrotic syndrome (NS) in Germany is not well known.

METHODS: An ESPED-based nationwide collection of epidemiological data of children in 2005 and 2006.

RESULT: The mean age of NS at onset was 5.5 ± 3.7 years. The gender ratio of boys to girls was 1.8:1. The average length of stay was 15.5 ± 11.2 days, with younger children remaining significantly longer in hospital. Steroid-resistance was more common in children ≥8 years (p = 0.023). Focal-segmental glomerulosclerosis (FSGS) was more common in children >10 years (p = 0.029). The ratio of males to females with FSGS was 1:1.9, thus the FSGS risk for girls at onset was 3.3-times greater. Considering the available data, the incidence of NS in Germany is 1.2/100,000 in the population <18 years, of which 1.0/100,000 are steroid-sensitive.

CONCLUSION: Compared with international data, which primarily focused on regional and small populations, this is the largest study about the incidence of the childhood NS.