Fig. 3From: Appropriate timing of performing abdominal ultrasonography and termination of follow-up observation for antenatal grade 1 or 2 hydronephrosisRate of time to reappearance of hydronephrosis. Kaplan–Meier method. Points displayed as crosses shows censored cases. The upper table in this figure shows the number of affected patients at risk at each observational point. The lower table in this figure shows the rate (%) of reapearance of hydronephrosis at each observational point. No cases showed reappearance of hydronephrosis after more than 1 yearBack to article page