Fig. 3From: Relationship of urinary endothelin-1 with estimated glomerular filtration rate in autosomal dominant polycystic kidney disease: a pilot cross-sectional analysisTotal kidney volume trended higher across quartiles of urine ET-1. Each box represents the 25th to 75th percentile, and the line represents the median total kidney volume within a given quartile of log urine ET-1. There was a trend towards higher total kidney volume as urine ET-1 increased, z = 1.83, P = 0.068Back to article page