Skip to main content
. Author manuscript; available in PMC: 2021 Aug 3.
Published before final editing as: Prev Med. 2020 Feb 3;133:106008. doi: 10.1016/j.ypmed.2020.106008

Table 2.

Undergraduate Student Substance Use Survey (N=754): Tobacco Use and Secondhand Smoke Exposure on Campus, Reported by Class Year

Class year Freshmen Sophomores Juniors Seniors Eta
Sample size (n) 226 189 181 158
Past 12-month tobacco use (%) 20% 19% 23% 21% 0.02
Past 30-day tobacco use (%) 14% 12% 18% 16% 0.04
Past 30-day secondhand smoke exposure on campus (%) 50% 56% 58% 66% 0.11*
*

indicates significant difference by class year at p<.05

Note: Eta measures the degree of association, ranging from 0 (no association) to 1.00 (high association), between an interval scale variable (e.g., class year) and a nominal scale variable (e.g., tobacco use, secondhand smoke exposure)