Mean age in which kids with DMD need assisted ventilation is how old?

• A. 17.5
• B. 18.0
• C. 21.0
• D. 19.8

Answer: (D)

In Duchenne muscular dystrophy, weakness of the respiratory muscles gradually progresses, and many patients require assistive ventilation during late adolescence as daytime and nocturnal hypoventilation develop. The average age at which this transition to ventilation occurs is about 19.8 years, placing it in the late teen years. That’s why this option best matches the common timing: it sits near the typical mean for needing ventilation. The other ages are earlier or later than the average, so they don’t align as well with the commonly reported mean. In practice, clinicians use measures of respiratory function and signs of nocturnal hypoventilation to decide when to initiate ventilation, often starting with nocturnal noninvasive ventilation as diaphragmatic and accessory muscle weakness progresses.