Pubertal diagram divided into four zones. Zone 1, ascending side, triradiate cartilage open, bone age between 11 and 13 years in girls and boys (Risser 0). Zone 2, ascending side, triradiate cartilage closed, bone age between 11 and 13 years in girls and between 13 and 15 years in boys (Risser 0). Zone 3, descending side, elbow closed but greater trochanter not fused, bone age between 13 and 16 years in girls and between 15 and 18 years in boys (Risser 1 to 2). Zone 4, descending side, elbow closed and greater trochanter fused, bone age between 13 and 16 years in girls and between 15 and 18 years in boys (Risser 3 to 4).