Final answer:
The low normal systolic blood pressure for a child between 1 and 10 years of age is usually between 80 and 110 mm Hg. Blood pressures for infants can be smaller than those for adults due to the shorter distance blood needs to travel in their bodies.
Step-by-step explanation:
The low normal systolic blood pressure (SBP) for a child between 1 and 10 years of age is calculated based on age-dependent reference ranges. These reference ranges are determined using data from a large population of healthy children. For example, a common reference range for a child between 1 and 10 years old is a systolic blood pressure of 80-110 mm Hg
The reason blood pressures for an infant could be smaller than those for an adult is due to the smaller height to which blood must be pumped. In infants, the distance the blood needs to travel from the heart to the blood vessels is shorter compared to adults. This results in lower pressure requirements for adequate blood perfusion in infants.