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["Table 2  Univariate Analysis of Prognostic Factors"]
["Characteristics","Median OS","P value","HR","95%CI for HR"]
["Age at diagnosis",null,"<0.001"]
["40-44 years",42,null,"Reference"]
["45-49 years",41,null,1.013,"0.829-1.237"]
["50-54 years",39,null,1.103,"0.915-1.329"]
["55-59 years",32,null,1.364,"1.139-1.634"]
["Race",null,"<0.001"]
["White",41,null,"Reference"]
["Black",28,null,1.498,"1.315-1.707"]
["Other a",38,null,1.003,"0.824-1.220"]
["Marital status",null,"<0.001"]
["Single",32,null,"Reference"]
["Married",42,null,0.723,"0.638-0.819"]
["Other b",35,null,0.903,"0.772-1.057"]
["Insurance",null,"<0.001"]
["Uninsured",26,null,"Reference"]
["Insured",38,null,0.633,"0.513-0.781"]
["Grade",null,"<0.001"]
["I",48,null,"Reference"]
["II",44,null,1.214,"0.953-1.547"]
["III or IV",28,null,2.071,"1.634-2.625"]
["Histology",null,0.003]
["Ductal",36,null,"Reference"]
["Lobular",44,null,0.748,"0.624-0.897"]
["Others",40,null,0.856,"0.713-1.028"]
["Laterality",null,0.084]
["Right",38,null,"Reference"]
["Left",38,null,1.058,"0.949-1.179"]
["Bilateral, single primary",13,null,2.254,"1.008-5.039"]
["Tumour subtype",null,"<0.001"]
["HR+/HER2-",39,null,"Reference"]
["HR+/HER2+",52,null,0.747,"0.640-0.873"]
["HR-/HER2-",11,null,3.571,"3.071-4.152"]
["HR-/HER2+",35,null,1.132,"0.917-1.397"]
["Bone+Lung metastases",null,"<0.001"]
["No",42,null,"Reference"]
["Yes",23,null,1.888,"1.679-2.123"]
["Bone+Liver metastases",null,"<0.001"]
["No",44,null,"Reference"]
["Yes",22,null,2.182,"1.950-2.443"]
["Bone+Brain metastases",null,"<0.001"]
["No",40,null,"Reference"]
["Yes",14,null,2.674,"2.245-3.184"]
["Only bone metastases",null,"<0.001"]
["No",46,null,"Reference"]
["Yes",24,null,2.29,"2.040-2.559"]
["Surgery",null,"<0.001"]
["No",32,null,"Reference"]
["Yes",52,null,0.496,"0.433-0.568"]
["Other a (American Indian/AK Native, Asian/Pacific Islander)"]
["Other b (Divorced/Widowed/Separated)"]

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