The developmental quotient (DQ) is calculated using a specific formula that compares a child's developmental age to their chronological age.
According to the provided information, because it is often difficult to accurately measure IQ in children younger than 6 years, the term global developmental delay is used when development is significantly delayed in two or more domains. The developmental quotient (DQ) is used in these contexts and calculated as follows:
DQ = [developmental age (DA)] divided by CA ×100 (7,8)
Let's break down this formula:
- Developmental Age (DA): This refers to the age at which a child is performing functionally. It is determined through standardized assessments that measure a child's skills across various domains (like motor skills, language, social skills, cognitive abilities) compared to typically developing children.
- Chronological Age (CA): This is the child's actual age in years and months since birth.
How the Calculation Works
To calculate the DQ, you:
- Determine the child's developmental age (DA) based on assessment results.
- Determine the child's chronological age (CA).
- Divide the developmental age by the chronological age.
- Multiply the result by 100.
The resulting number is the child's developmental quotient. A DQ of 100 means the child's developmental age matches their chronological age. A DQ significantly below 100 suggests a delay in development.
This method provides a way to quantify a child's developmental rate relative to their peers, particularly useful before standardized IQ testing becomes reliable.
