Table 1.

Summary of data collected on each of the PLCO questionnaires administered between 1993 and 2015.

	Questionnaire	BQX	DHQ	DQX	SQX	MUQ
	Year(s) Administered	1993–2001	1998–2001	1993–2001	2006–2007	2013
	Intervention/Control Arm	Both	Both	Intervention Only	Both	Both
	N Completed	~150,000	~113,000	~61,000	~104,000	~60,000
Risk Factor Categories	Risk Factor Variables
	Race/Ethnicity	✓			✓
Demographics	Income				✓
	Marital Status	✓			✓
	Education	✓
	Smoking	✓			✓	✓
Lifestyle & Anthropometry	Alcohol use		✓	✓
	Physical Activity		✓	✓	✓
	Anthropometry	✓			✓	✓
	Family history of cancer	✓			✓
Medical History	Personal history of cancer	✓
	Personal medical history	✓			✓
	N SAIDs/Aspirin/Acetaminophen	✓			✓	✓
Medication Use	Prescription medication use					✓
	Reproductive history	✓			✓
F emale-specific	Cancer screening	✓			✓
	Hormone therapy	✓			✓
	Male pattern baldness				✓
Male-specific	Urinary/prostate symptoms	✓			✓
	Dietary Intake		✓	✓
Diet	Supplemental Vitamin Use		✓	✓