Skip to main content

Table 1 Characteristics of study population by radiotherapy group and laterality

From: Increased cardiovascular mortality more than fifteen years after radiotherapy for breast cancer: a population-based study

   No radiotherapy Radiotherapy p- value
   Right Left Right Left  
Age (years) Mean 58.1 58.4 54.5 54.8 < 0.001
  S.D. 13.2 13.2 11.6 11.4  
IMD quintile 1 1027 (21.9%) 1045 (20.8%) 1338 (24.6%) 1371 (24.0%) < 0.001
  2 932 (19.9%) 1066 (21.2%) 1135 (20.9%) 1183 (20.7%)  
  3 890 (19.0%) 928 (18.4%) 1023 (18.8%) 1095 (19.2%)  
  4 979 (20.9%) 1072 (21.3%) 1007 (18.5%) 1042 (18.3%)  
  5 760 (16.2%) 843 (16.8%) 871 (16.0%) 936 (16.4%)  
  N/K 106 (2.3%) 78 (1.6%) 67 (1.2%) 77 (1.4%)  
Stage 1 2557 (54.5%) 2651 (52.7%) 2677 (49.2%) 2758 (48.4%) < 0.001
  2 316 (6.7%) 331 (6.6%) 566 (10.4%) 553 (9.7%)  
  3 523 (11.1%) 554 (11.0%) 1016 (18.7%) 1071 (18.8%)  
  4 103 (2.2%) 105 (2.1%) 89 (1.6%) 92 (1.6%)  
  N/K 1195 (25.5%) 1391 (27.6%) 1093 (20.1%) 1230 (21.6%)  
Chemotherapy No 4457 (95.0%) 4804 (95.5%) 5180 (95.2%) 5443 (95.4%) 0.602
  Yes 237 (5.0%) 228 (4.5%) 261 (4.8%) 261 (4.6%)  
Hormone Therapy No 3445 (73.6%) 3785 (75.2%) 3904 (71.8%) 4127 (72.4%) < 0.001
  Yes 1239 (26.4%) 1247 (24.8%) 1537 (28.2%) 1577 (27.6%)  
Follow-up (years) Mean 20.31 20.46 19.26 19.19 < 0.001
  S.D. 5.45 5.50 5.02 4.97  
  Median 19.57 19.73 17.94 17.86 < 0.001
Total cases   4694 5032 5441 5704