Smoothed colorectal cancer mortality rate (per 100 000 person-years) in the screening and control arm over follow-up time, and ratio of the mortality rates by study arm and sex. Smoothed colorectal cancer mortality rate (per 100 000 person-years) in the screening and control arm over follow-up time, and ratio of the mortality rates by study arm and sex. Dotted lines show the limits of 95% CIs for the rate ratio. J Pitkäniemi et al. BMJ Open Gastroenterol 2015;2:e000034 Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions