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Table 3 Socio-demographic and tumour characteristics associated with use of adjuvant radiotherapy

From: A cohort study of ethnic differences in use of adjuvant chemotherapy and radiation therapy for breast cancer in New Zealand

   Use of radiotherapy
Characteristic Total population (N = 1708) Total (N = 1708) NZ European (N = 1418) Māori (N = 225)
  n (%) n (%)a p n (%)a n (%)a
Overall 1708 1491 (87.3)   1255 (87.8) 189 (84.0)
Age (yrs.)    <0.001   
  < 40 79 (4.6) 76 (96.2)   50 (96.2) 16 (94.1)
 40-49 328 (19.2) 302 (92.1)   231 (93.9) 52 (86.7)
 50-59 499 (29.2) 456 (91.4)   377 (92.0) 66 (90.4)
 60-69 471 (27.6) 417 (88.5)   361 (90.5) 45 (75.0)
 70-79 218 (12.8) 172 (78.9)   161 (78.9) 8 (72.7)
 80+ 113 (6.6) 68 (60.2)   65 (60.7) 2 (50.0)
Diagnosis year    0.003   
 1999-2002 357 (20.9) 296 (82.9)   255 (83.9) 30 (76.9)
 2003-2006 506 (29.6) 443 (87.5)   396 (88.0) 37 (86.0)
 2007-2009 406 (23.8) 354 (87.2)   284 (87.4) 50 (84.7)
 2010-2012 439 (25.7) 398 (90.7)   310 (91.4) 72 (85.7)
Deprivation    0.006   
 Dep 1-2 178 (10.4) 167 (93.8)   156 (94.0) 5 (83.3)
 Dep 3-4 186 (10.9) 163 (87.6)   140 (87.5) 17 (94.4)
 Dep 5-6 414 (24.2) 364 (87.9)   318 (88.1) 37 (90.2)
 Dep 7-8 491 (28.7) 423 (86.2)   356 (87.9) 54 (77.1)
 Dep 9-10 439 (25.7) 374 (85.2)   275 (84.4) 76 (84.4)
Distance    0.005   
  < 10km 546 (32.0) 489 (89.6)   409 (90.5) 54 (85.7)
 10-50km 660 (38.6) 579 (89.1)   488 (88.1) 70 (85.6)
 50-100km 428 (25.1) 364 (85.0)   310 (85.4) 49 (83.1)
  > 100km 74 (4.3) 59 (79.7)   38 (79.2) 16 (76.2)
 Missing      
Diagnostic type    <0.001   
 Screen detected 750 (43.9) 698 (93.1)   602 (93.3) 76 (90.5)
 Symptomatic 958 (56.1) 793 (82.8)   643 (83.2) 113 (80.1)
Hospital type    <0.001   
 Private 535 (31.3) 488 (91.2)   453 (91.5) 25 (86.2)
 Public 1173 (68.7) 1003 (85.5)   792 (85.8) 164 (83.7)
Surgery type    <0.001   
 BCS 1354 (79.3) 1213 (89.6)   1031 (89.7) 143 (88.8)
 Mastectomy 354 (20.7) 278 (78.5)   214 (79.9) 46 (71.9)
Grade    0.493   
 Grade I 441 (25.8) 381 (86.4)   341 (87.0) 27 (79.4)
 Grade II 865 (50.6) 754 (87.2)   626 (88.0) 102 (82.9)
 Grade III 371 (21.7) 331 (89.2)   257 (89.2) 56 (87.5)
 Unknown 31 (1.8) 25 (80.6)   21 (77.8) 4 (100)
T stage    <0.001   
 T1 1020 (59.7) 915 (90.1)   790 (90.1) 98 (89.9)
 T2 518 (30.3) 437 (84.4)   356 (85.8) 57 (76.0)
 T3 100 (5.9) 79 (79.0)   54 (76.1) 20 (87.0)
 T4 70 (4.1) 58 (82.9)   43 (84.3) 14 (77.8)
N stage    0.042   
 0 1029 (60.3) 900 (87.8)   762 (87.8) 106 (86.9)
 1 363 (21.2) 321 (88.9)   266 (90.2) 45 (83.3)
 2+ 316 (18.5) 266 (84.2)   215 (93.1) 36 (76.6)
Charlson score    <0.001   
 0 1456 (85.2) 1312 (90.1)   1111 (90.7) 151 (85.8)
 1+ 252 (14.8) 179 (71.0)   134 (69.4) 38 (77.6)
  1. aProportion of women who had received radiotherapy in each category