Table 3.

Risk of Publication Bias Graph

Study	Was Allocation Sequence Adequately Generated?	Was Allocation Adequately Concealed?	Was Knowledge-Allocated Intervention Adequately Prevented During the Study?	Were Incomplete Outcome Data Adequately Addressed?
Weg et al,8 1994	Yes	Yes	Yes	Yes
Anzueto et al,9 1996	Yes	Yes	Yes	Yes
Gregory et al,10 1997	Unclear⁎	Unclear⁎	Yes	Yes
Spragg et al,11 2003	Yes	Yes	Yes	No
Spragg et al,12 2004	Yes	Unclear⁎	Yes	Yes
Markart et al,13 2007	Unclear⁎	Unclear⁎	Yes	Yes
Tsangaris et al,14 2007	Yes	Unclear⁎	Yes	Yes
Kesecioglu et al,15 2009	Yes	Yes	Yes	Yes
Spragg et al,16 2010	Yes	yes	Yes	Yes

^⁎Insufficient information from one article about the process to permit a judgment of “yes” or “no.”