Abnormal upper to lower segment ratio Reduced upper to lower segment ratio 2014-04-07T03:14:28Z HP:0012773 Decreased ratio between the upper and the lower segment of the body, where the lower segment is defined as the length between the top of pubic symphysis to floor, and the upper segment is defined as the top of head to top of pubic symphysis. Consider the term Disproportionate tall stature (HP:0001519) if tall stature is also present. UMLS:C1836996 A ratio of less than 0.86 (or according to other sources 0.89) is considered abnormally reduced.