Fig. 1From: Decreased vitamin D levels in children with primary mono-symptomatic nocturnal enuresisReceiver operating characteristics (ROC) curve. Receiver operating characteristics (ROC) curve was used to define the best cut-off value of vitamin D that was ≤ 19 ng/ml, with sensitivity of 46% %, specificity of 84%, positive predictive value of 74.2% and negative predictive value of 60.9%, with an area under the curve (AUC) of 0.616, P < 0.046Back to article page