Figure 2. Estimated number needed to treat to prevent one new cardiovascular disease event in different stratification strategies by five year age groups for men and women, with risk estimations by version 2 of the QRISK cardiovascular disease risk algorithm (QRISK2). Strategy A identified individuals with a high risk of cardiovascular disease as those with an estimated 10 year risk of cardiovascular disease ≥10% (fixed threshold). Strategy B identified individuals with a high risk of cardiovascular disease as those with an estimated 10 year risk of cardiovascular disease ≥10% or ≥90th centile of age and sex specific risk distributions (age and sex specific thresholds).