Constitutional and physiologic delay Children who are healthy but have a slower rate of physical development than average have a constitutional delay with a subsequent delay in puberty. Usually 20 to 50th  and even shorter. It is the most common cause of delayed puberty in girls (30\%) and even more so in boys (65\%). It is commonly inherited with as much as 80\% of the variation in the age of onset of puberty due to genetic factors. These children have a history of shorter stature than their age-matched peers throughout childhood, but their height is appropriate for bone age, meaning that they have delayed skeletal maturation with potential for future growth.
Constitutional and physiologic delay Children who are healthy but have a slower rate of physical development than average have a constitutional delay with a subsequent delay in puberty. Usually between 20th to 50th percentile and even shorter. It is the most common cause of delayed puberty in girls (30\%) and even more so in boys (65\%). It is commonly inherited with as much as 80\% of the variation in the age of onset of puberty due to genetic factors. These children have a history of shorter stature than their age-matched peers throughout childhood, but their height is appropriate for bone age, meaning that they have delayed skeletal maturation with potential for future growth.
R
20
between 20th
A
percentile