TABLE 2—

Implementation of Tobacco Quitline Practices, by Evidence Level: United States and Canada, 2009

Evidence Group	Quitlines Implementing Each Type of Practice, Mean %
A level for efficacy	73.8
B level for efficacy	51.3
A or B level for efficacy	58.3
C level for efficacy	43.7
D level for efficacy	44.9
C or D level for efficacy	44.1
B level for reach	56.2
D level for reach	50.3

Note. A = practices that are effective, as indicated by findings of 1 or more meta-analyses or multiple high-quality single studies; B = practices with only 1 high-quality, or several inferior-quality (smaller sample size, single site, or small effect size), peer-reviewed journal articles and no meta-analyses documenting their effectiveness; C = practices that have been recommended by a reputable organization such as the Centers for Disease Control and Prevention but have no peer-reviewed journal articles documenting their effectiveness; D = practices that were not supported by any scientific evidence or recommendations from reputable organizations.