[ythdrk1b.txt, updated 11/07]

YRBS: Prevalence of drinking in the past 30 days, by grade and sex,
United States, 1991-2005.

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                                         Grade
Sex,     ------------------------------------------------------------------
and       Total       9th grade     10th grade    11th grade    12th grade
Year   Percent S.E.  Percent S.E.  Percent S.E.  Percent S.E.  Percent S.E.
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Both Sexes
2005      43.3  1.4     36.2  1.2     42.0  2.0     46.0  2.0     50.8  2.1
2003      44.9  1.2     36.2  1.4     43.5  1.7     47.0  2.1     55.9  1.6
2001      47.1  1.1     41.1  1.8     45.2  1.3     49.3  1.7     55.2  1.5
1999      50.0  1.3     40.6  2.2     49.7  1.9     50.9  2.0     61.7  2.2
1997      50.8  1.4     44.2  3.1     47.2  2.2     53.2  1.5     57.3  2.5
1995      51.6  1.2     45.6  1.9     49.5  2.4     53.7  1.5     56.5  1.6
1993      48.0  1.1     40.5  1.8     44.0  2.0     49.7  1.7     56.4  1.4
1991      50.8  1.7     40.9  2.6     47.8  1.7     54.5  2.0     59.9  2.2

Male
2005      43.8  1.4     36.3  1.7     41.4  2.3     47.8  2.1     52.0  2.1
2003      43.8  1.3     33.9  1.8     42.2  1.9     47.3  2.2     56.0  1.9
2001      49.2  1.4     42.2  2.3     46.9  1.6     53.6  2.2     56.6  1.6
1999      52.3  1.5     40.2  2.2     52.7  3.0     53.5  2.9     66.6  2.3
1997      53.3  1.2     44.7  3.8     48.7  2.0     57.8  1.5     60.2  2.9
1995      53.2  1.3     46.9  2.4     50.4  3.1     55.5  2.0     59.5  2.0
1993      50.1  1.2     40.2  2.2     44.1  2.2     53.6  2.2     60.5  2.2
1991      52.7  2.0     40.2  3.5     48.9  1.8     58.5  2.7     62.8  2.9

Female
2005      42.8  1.6     36.2  1.7     42.7  1.9     44.2  2.5     49.6  2.6
2003      45.8  1.3     38.5  1.7     44.9  1.8     46.8  2.4     55.5  2.0
2001      45.0  1.1     40.0  2.0     43.5  1.6     45.1  1.5     53.9  2.2
1999      47.7  1.4     41.0  3.0     46.8  1.6     48.3  2.6     56.9  3.0
1997      47.8  2.0     43.7  3.4     45.3  3.8     47.8  3.2     53.7  2.8
1995      49.9  1.8     43.7  2.9     48.6  2.7     51.8  2.6     53.6  2.6
1993      45.9  1.3     40.5  2.8     44.0  2.2     45.9  2.0     52.0  1.7
1991      48.8  1.6     41.5  2.6     46.6  2.4     50.2  2.1     56.9  2.0
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Source: Alcohol Epidemiologic Data System. Newes-Adeyi, G.; Chen, C.M.;
        Williams, G.D.; and Faden, V.B. Surveillance Report #81: Trends in
        Underage Drinking in the United States, 1991-2005. Bethesda, MD:
        National Institute on Alcohol Abuse and Alcoholism, Division of
        Epidemiology and Prevention Research (October 2007).