- 0Tissues with national screening programme. **Number of cases per week. *Ratio expressed as % of the numbers observed in 2020 and the numbers observed in 2019 with, in brackets, the confidence interval of this ratio, calculated using the standard error of a ratio of two independent Poisson distributed count variables. P1-P5 refers to periods mentioned in Table 1. Red and green boxes show situations where the confidence interval of the ratio of measured and expected does not contain 100% and is considered statistically significantly different. The red numbers show a ratio of less than 85%, which might be clinically significant
