What is the scoring for marked lower chest retraction according to the Silverman-Anderson Index?

The correct scoring for marked lower chest retraction according to the Silverman-Anderson Index is 2. In this scoring system, various clinical signs are assessed to evaluate the respiratory distress in neonates, with specific points assigned to signs based on their severity.

Marked lower chest retraction is an indicator of significant respiratory distress, as it suggests that the neonate is working hard to breathe and is experiencing increased resistance in airflow. A score of 2 reflects this severity appropriately, distinguishing it from less pronounced retraction, which would receive a lower score. The index aims to provide a standardized method to gauge respiratory effort and distress in newborns, making it critical for timely and effective clinical decisions.