Table 3.

Ingredients of control arm, by trial document type

Trial	Clinical study report	Informed consent form	Register	Publication
V501-012	225 mcg of aluminium as AAHS in normal saline	Inactive solution (containing aluminium 225 mcg/dose)	Control intervention not listed	Aluminium-containing placebo
V501-013	225 mcg of aluminium as AAHS in normal saline	Inactive solution (containing aluminium 225 mcg/dose)	No ingredients listed; only states ‘placebo’	Aluminium-containing placebo
V501-015	225 mcg of aluminium as AAHS in normal saline	Inactive solution (containing aluminium 225 mcg/dose)	No ingredients listed; only states ‘placebo’	Aluminium-containing placebo
V501-019	Merck standard aluminium diluent (225 mcg alum) in normal saline	No ingredients listed. Only states: ‘The HPV vaccine placebo contains no active vaccine’	No ingredients listed; only states ‘placebo’	Aluminium-containing placebo
V501-020	225 mcg of aluminium as AAHS in normal saline	No ingredients listed. Only states: ‘placebo, an injection that looks the same as the vaccine but has no active ingredient’	No ingredients listed; only states ‘placebo’	AAHS-containing placebo

Normal saline = USP (NaCl 0.9%).

AAHS, amorphous aluminum hydroxyphosphate sulfate.