Median ( range ) therapeutic doses by age group were as follows : infants ( n = @ ) , @ IU kg ( -@ ) ( @-@ IU kg ( -@ ) ) ; children ( n = @ ) , @ IU kg ( -@ ) ( @-@ IU kg ( -@ ) ) ; and adolescents ( n = @ ) , @ IU kg ( -@ ) ( @-@ IU kg ( -@ ) ) .