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. Author manuscript; available in PMC: 2013 Aug 1.
Published in final edited form as: J Adolesc Health. 2012 Feb 13;51(2):150–155. doi: 10.1016/j.jadohealth.2011.11.021

Table 1.

Percentages, Means and Standard Deviations of Cigarette Use in Last Year by Grade and Sex.

Grade 9 Grade 10 Grade 11 Grade 12

Boys (n=372) Girls (n=389) Boys (n=373) Girls (n=371) Boys (n=266) Girls (n=276) Boys (n=181) Girls (n=172)
Did not smoke 81.5 76.9 74.0 67.9 61.7 65.6 51.9 59.9
Smoked once 4.8 6.9 5.6 7.8 8.6 6.9 9.4 4.1
Smoked a couple of times 7.8 7.7 10.7 10.5 16.2 8.3 17.7 13.4
Smoked some each month 1.9 1.8 3.2 1.9 2.6 3.3 3.9 3.5
Smoked some each week 2.2 1.8 2.1 1.9 3.4 4.3 4.4 4.7
Smoked some each day 1.9 4.9 4.3 10.0 7.5 11.6 12.7 14.5
M .44 .59 .67 .92 1.00 1.09 1.38 1.33
SD 1.07 1.30 1.32 1.62 1.55 1.77 1.78 1.88

Note. M = Mean; SD = Standard Deviation. Range for cigarette use in all grades is 0 to 5.