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First time | 31% |
30% | |
More than once a day | 10% |
6% | |
Daily | 13% |
13% | |
About once a week | 25% |
30% | |
About once a month | 17% |
15% | |
Every 6 months or less | 5% |
6% |
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Disclaimers | Copyright | Privacy | Accessibility | Quality Guidelines U.S. National Library of Medicine, 8600 Rockville Pike, Bethesda, MD 20894 National Institutes of Health | Department of Health & Human Services |
Date last updated: 23 April 2007 |