This is the first study with national data on the prevalence of ED in the United States.

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This is the first study with national data on the prevalence of ED in the United States. ED varies by age, with 5 percent of men aged 20 to 40 having ED, to 70 percent of men 70 and older.

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Men who reported being physically active were much less likely to have ED compared to men who reported no daily physical activity. Similarly, men who reported being sedentary - measured by hours of daily television viewing and video and computer use - were much more likely to have ED, even after accounting for other risk factors.

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The association of ED with cardiovascular risk factors may be a powerful motivator for men for whom diet and lifestyle changes are indicated.

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