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Table 1 Cardiac mortality in radiation trials before 1973 and after 1993

From: Radiation impact in breast cancer

  Cardiac deathsa Hazard ratio (95% confidence interval)
Diagnosed before 1973
   Follow up <5 years 230/180 1.19 (0.98 to 1.45)
   Follow up >5 years 189/145 1.21 (0.97 to 1.50)
Diagnosed after 1993
   Follow up < 5 years 230/180 0.95 (0.79 to 1.14)
   Follow up > 5 years 189/145 0.99 (0.73 to 1.50)
  1. aLeft-sided radiation versus right-sided radiation.