Table 2.

Risk of bias

Author (Year)	Selection bias		Performance bias	Detection bias	Attrition bias	Reporting bias
	Random sequence generation	Allocation concealment	Blinding of participants and personnel	Blinding of outcome assessment	Incomplete outcome data	Selective reporting
RCTs measuring mammography attendance
Champion et al (2006)	1	2	2	0	2	0
Jandorf et al (2008)	0	0	2	0	2	0
Lee et al (2014)	0	1	2	0	1	0
Maxwell et al (2003)	1	1	2	0	0	0
Mishra Shiraz et al (2007)	1	1	2	0	1	0
Sadler et al (2011)	1	1	2	0	1	0
Wang et al (2012)	1	1	2	0	0	0
RCTs measuring Pap test attendance
Byrd et al (2013)	0	1	2	0	0	0
Jandorf et al (2008)	0	0	2	0	2	0
Maxwell et al (2003)	1	1	2	0	0	0
O'Brien et al (2010)	1	1	2	0	1	0