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Table 1 Patient and tumor characteristics by self-identified race

From: Insulin resistance contributes to racial disparities in breast cancer prognosis in US women

 TotalWhiteBlackp value
N(%)515 (100%)428 (83%)87 (17%) 
Age, mean (SD)58.3 (12.4)58.3 (12.3)58.1 (13.2)0.9
Metabolic characteristics
 BMI, mean (kg/m2)27.1 (6.4)26.3 (5.9)31.2 (6.8)< .0001
 Obese (BMI ≥ 30 kg/m2)120 (24%)79 (19%)41 (47%)< .0001
 Abdominal obesity (WC > 88 cm)332 (72%)250 (67%)82 (96%)< .0001
 Metabolic syndrome120 (23%)85 (20%)35 (40%)< .0001
Comorbidities
 Charlson Comorbidity Index (≥ 1)284 (55%)225 (53%)59 (68%)0.01
Tumor characteristics
 Tumor size, cm1.5 (1.2)1.5 (1.2)1.7 (1.2)0.2
 Stage   0.05
  I327 (64%)281 (66%)46 (53%) 
  II169 (33%)133 (31%)36 (41%) 
  III19 (4%)14 (3%)5 (6%) 
 Insulin resistant (HOMA-IR >  2.8)57 (11%)42 (10%)15 (17%)0.04
 NPI > 4.487 (17%)63 (15%)24 (28%)0.004
 iNPI >5.417 (3%)9 (2%)8 (9%)0.001
Tumor hormone receptor status
 Estrogen receptor positive433 (88%)371 (91%)62 (77%)0.0003
 Progesterone receptor positive405 (83%)346 (85%)59 (73%)0.01
 Her2 positive31 (6%)25 (6%)6 (8%)0.65
 Triple negative38 (8%)28 (6%)13 (16%)0.01
Screening behavior
 Mammogram ≥ 2 years before diagnosis108 (22%)91 (22%)17 (20%)0.6
Lifestyle factors
 Smoking: never smoker265 (54%)211 (52%)54 (64%)0.04
 Alcohol: > 2 drinks/week122 (25%)118 (29%)4 (5%)< .0001
 Diet: very good/excellent diet264 (54%)239 (59%)25 (30%)< .0001
 Physical activity: sedentary236 (49%)184 (47%)52 (60%)0.02
Socioeconomic factors
 Education: < college education85 (18%)54 (14%)31 (38%)< .0001
 Income: < $75,000/year70 (40%)43 (31%)27 (75%)< .0001
 Insurance: commercial insurance436 (89%)364 (90%)72 (84%)0.1