Comparison 5. Secondary outcome: false positives, negatives and recalls (number of screens).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
5.1 False positive at baseline	3	56101	Risk Ratio (M‐H, Random, 95% CI)	2.82 [1.98, 4.01]
5.2 False negative	1		Risk Ratio (M‐H, Random, 95% CI)	Totals not selected
5.2.1 baseline	1		Risk Ratio (M‐H, Random, 95% CI)	Totals not selected
5.2.2 at year 1	1		Risk Ratio (M‐H, Random, 95% CI)	Totals not selected
5.2.3 at year 2	1		Risk Ratio (M‐H, Random, 95% CI)	Totals not selected
5.3 Recall rates at baseline	2	55480	Risk Ratio (M‐H, Random, 95% CI)	5.31 [1.73, 16.34]