. Author manuscript; available in PMC: 2017 Jan 1.

Published in final edited form as: Clin Cancer Res. 2015 Aug 19;22(1):243–249. doi: 10.1158/1078-0432.CCR-15-0941

Table 4. Prostate cancer mortality by arm, with mortality reduction and number needed to invite by ERSPC center.

CENTER	Cumulative PC mortality, %		Mortality reduction	Number needed to invite	Number needed to detect
CENTER	Screening, Ms	Control, Mc	(Mc-Ms), %	(1/mortality reduction)^*	(NNI/NNO)^#
The Netherlands	0.49	0.72	0.24	422 (253-1381)	27
Belgium	0.42	0.54	0.12	816 (243 – ND)	18
Sweden	0.64	1.04	0.40	252 (140-1534)	12
Finland	0.53	0.59	0.05	1821 (631 – ND)	37
Italy	0.36	0.44	0.08	1198 (349 – ND)	29
Spain	0.19	0.35	0.16	621 (419 – ND)	23
Switzerland	0.32	0.28	-0.04	ND^§	ND^§

Expressed as an integer, with rounding upward

^§

No mortality reduction, NNI not meaningful

1Number needed to detect/number needed for overdiagnosis (1/mortality reduction : 1/excess incidence = excess incidence/mortality reduction)