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FIGURE 6 Trends in asthma mortality, U.S. age-adjusted death rates, 1979–1987. Source: NHLBI, 1991. Work and school absenteeism as a result of allergic reactions of the upper airway contributes to the economic burden posed by indoor allergens. Although complete data are lacking, sufficient information exists to conclude that indoor allergens constitute a substantial public health problem. Given the amount of time most Americans spend indoors, expanded efforts to assess, prevent, and control the health threats posed by indoor allergens are warranted. 
FIGURE 7 Trends in asthma hospitalization rates. Source: NHLBI, 1991.
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