What is the ideal reliability coefficient for a screening instrument for anxiety and depression?

An ideal reliability coefficient for a screening instrument for anxiety and depression should be high enough to ensure that the tool consistently measures what it is intended to measure. A coefficient of 0.80 is generally considered the threshold for strong reliability in psychological assessments. This indicates that there is a high level of agreement between the results of the instrument when administered in similar conditions or repeated over time.

A reliability coefficient at this level suggests that the instrument can produce consistent results across different settings and samples, making it a valid tool for identifying individuals who may be at risk for anxiety and depression. This consistency is crucial, especially in a school environment where timely and accurate identification can lead to appropriate interventions and support.

Lower reliability coefficients, such as those in the range of 0.25, 0.40, or 0.50, would indicate a poor level of reliability, suggesting that the screening results could vary significantly and may lead to misidentification of students' needs. Tools with such low coefficients may not be dependable for making clinical decisions or ensuring effective mental health support.