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Table 2 Comparison between women excluded from the final analysis versus those included in the final analysis, Sartorius Cohort 1970–1991.

From: Epithelial cells in nipple aspirate fluid and subsequent breast cancer risk: A historic prospective study

  Excluded from Analysis Included in Analysis  
Basic Stats N = 1534 N = 946 ANOVA
Age at NAF visit:    
Mean 43.9 * 42.6  
Median 42 41  
Std Err 0.39 0.42  
Min-max 16–89 16–87  
    p = 0.04
Age at breast cancer diagnosis:    
N 81 ** 93  
Mean 62.0 60.8  
Median 62 62  
Std Err 1.5 1.27  
Min-max 30–89 34–86  
    p = 0.54
Breast cancer: n (%) n (%)  
  90 (6%) 93 (10%) Chi Square
    p <0.001
NAF Cytology: n (%) n (%)  
No fluid 929 (61%) 714 (75%)  
Insufficient specimen 45 (3%) 19 (2%)  
Normal 232 (15%) 89 (9%)  
Hyperplasia 234 (15%) 97 (10%)  
Atypia 81 (5%) 27 (3%)  
[Unable to classify] 13 (1%)   
    p <0.001
  1. * N = 1525
  2. ** 9 missing NAF age
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