Growth Hormone (GH) Deficiency & Insulin Like Growth Factor 1 (IGF-I)/ Insulin Like Growth Factor Binding Protein 3 (IGFBP-3) Ratio

Inclusion Criteria: * children presented to Jordan Univeristy Hospital (JUH) outpatient endocrinology clinic for the evaluation of short stature (SS) Exclusion Criteria: (i) their parents could not provide written consent for them; (ii) they were lost to follow up; (iii) they could not perform clonidine stimulation tests (CST) or insulin tolerance test (ITT) due to a medical contraindication (e.g. cardiac disorder, seizure disorder); (iv) they had received GH therapy in the past; (v) they were known to have pituitary diseases, hypothyroidism, hypogonadism or discovered to have panhypopituitarism or (vi) they have malnutrition, diabetes mellitus, liver disease, or other chronic illnesses.