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Table 1 Patient and tumour characteristics by period of diagnosis among patients aged 60–64 years1

From: Remarkable change in age-specific breast cancer incidence in the Swiss canton of Geneva and its possible relation with the use of hormone replacement therapy

Patient and tumour characteristics 1975–1979 1985–1989 N = 218 (%) 1997–2000 2001–2003 N = 389 (%) P value for X2 of heterogeneity
Social class2    
   High 8 (6%) 72 (19%) P < 0.0000
   Medium 57 (44%) 203 (52%)  
   Low 26 (20%) 53 (14%)  
   Unknown 39 (30%) 61 (16%)  
Method of detection    
   Screening 31 (14%) 199 (51%) P < 0.0000
   Other 187 (86%) 190 (49%)  
Stage at diagnosis    
   I 69 (32%) 186 (48%) P < 0.0000
   II 95 (44%) 149 (38%)  
   III and more 34 (16%) 42 (11%)  
   Unknown 20 (09%) 12 (3%)  
Oestrogen 3 receptors    
   Positive 43 (61%) 311 (80%) P = 0.002
   Negative 18 (25%) 53 (14%)  
   Unknown 10 (14%) 25 (6%)  
Histological type    
   Ductal 173 (79%) 311 (80%) P < 0.0000
   Lobular 4 (2%) 53 (14%)  
   Other 41 (19%) 25 (6%)  
  1. 1) the age in which the incidence peak was observed after 1997
  2. 2) the first period concerned 1985–1989 as information on the woman's last occupation was available only after 1980;
  3. 3) the fist period concerned the years 1995–1996 as information on oestrogen receptor status was available only from 1995.