The estimate of lost work and school time from asthma is approximately 100 million days of restricted activity. Approximately 500,000 annual hospitalizations (40.6% in individuals aged 18 y or younger) are due to asthma. Each year, an estimated 1.81 million people (47.8% of them aged 18 y or younger) require treatment in an emergency department.[37] For 2010, the annual expenditures for health and lost productivity due to asthma are projected to be $20.7 billion.[38]