Fig. 1From: Ultrasound versus anatomical landmarks for caudal epidural anesthesia in pediatric patientsCorrelation between age and the length of the triangle base in children under 10 years old. Age is plotted versus the distance between the bilateral superolateral sacral crests. There was a significant positive correlation between age and the distance between the two crests up to the age of 10 years. Spearman’s r value was 0.97Back to article page