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Table 4 Multivariate logistic regression analysis for relative risk ratio of ER negative BC stratified by age, origin, pathologic tumour size, lymph-node metastasis and grade in both groups of cohort study (Eritrean and Sudanese women)

From: Immunohistochemistry defined subtypes of breast cancer in 678 Sudanese and Eritrean women; hospitals based case series

Clinical and tumour characteristics p-value Risk ratio 95% Confidence interval
Lower Upper
Age in years Age ≤ 50 compared to >50 .039 1.480 1.019 2.149
Origin Eritrean (reference Sudanese) .956 .988 .634 1.537
Histologic type aIDCNST (reference) .198    
Invasive lobular carcinoma .051 .847 .780 1.211
other .532 .833 .469 1.479
Pathologic Tumour size pT1 (reference) .081    
pT2 .154 1.438 .873 2.368
pT3 .013 2.050 1.162 3.615
pT4 .632 1.194 .577 2.471
Lymph Node involvement pN0 (reference) .306    
pN1 .149 1.432 .880 2.332
pN2 .694 1.106 .670 1.823
pN3 .133 1.556 .875 2.768
Grade GIII (GI/II reference) .000 2.203 1.534 3.164
  1. a IDCNST= invasive ductal carcinoma, no special type