The systematic review conducted by Jansen et al. , recently published in your journal, aimed to assess the effect of organised cervical screening programmes on cervical cancer mortality in Europe. For Northern Europe, the authors concluded that screening reduced cervical cancer mortality by 41–87%. The latter figure was extracted from the study we conducted in Denmark using nationwide population-based health registers . The authors evaluated our study as having a low risk of bias, scoring 7 of 9 on the Newcastle-Ottawa scale.