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. Author manuscript; available in PMC: 2017 Jun 16.
Published in final edited form as: J Adolesc. 2013 Dec 10;37(2):133–143. doi: 10.1016/j.adolescence.2013.11.004

Table 2.

Article Topics Overall and by Year, Overall Sample (n=447 articles)

% of Articles Containing Topic by Year
2005 2006 2007 2008 2009
Article Topica Total % n=28 n=98 n=249 n=63 n=9 X²*
HPV/Vaccine/Cancer Characteristics 287 64 71 79 50 90 89 <0.001
Government/State Activities 246 55 25 59 61 43 11 0.002
Social Influences/ Reactions/Attitudes 117 26 46 18 30 14 33 0.08
Stakeholders 112 25 32 19 28 19 22 0.23
Behaviors 49 11 18 14 8 11 22 0.14
Ethical Issues 36 8 0 2 11 10 0 0.005
a

Up to two topics were coded for each article; 400 articles had two main topics, and 47 had one; a total of 847 topic codes were assigned to 447 articles. Column percents for frequency of topic appearance total >100%.

*

p-values reported for Pearson X² test for the variable by time where 2007 was the reference year compared to 2005-2006 and 2008-2009.