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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

  Total White Black p 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 syndrome 120 (23%) 85 (20%) 35 (40%) < .0001
Comorbidities
 Charlson Comorbidity Index (≥ 1) 284 (55%) 225 (53%) 59 (68%) 0.01
Tumor characteristics
 Tumor size, cm 1.5 (1.2) 1.5 (1.2) 1.7 (1.2) 0.2
 Stage     0.05
  I 327 (64%) 281 (66%) 46 (53%)  
  II 169 (33%) 133 (31%) 36 (41%)  
  III 19 (4%) 14 (3%) 5 (6%)  
 Insulin resistant (HOMA-IR >  2.8) 57 (11%) 42 (10%) 15 (17%) 0.04
 NPI > 4.4 87 (17%) 63 (15%) 24 (28%) 0.004
 iNPI >5.4 17 (3%) 9 (2%) 8 (9%) 0.001
Tumor hormone receptor status
 Estrogen receptor positive 433 (88%) 371 (91%) 62 (77%) 0.0003
 Progesterone receptor positive 405 (83%) 346 (85%) 59 (73%) 0.01
 Her2 positive 31 (6%) 25 (6%) 6 (8%) 0.65
 Triple negative 38 (8%) 28 (6%) 13 (16%) 0.01
Screening behavior
 Mammogram ≥ 2 years before diagnosis 108 (22%) 91 (22%) 17 (20%) 0.6
Lifestyle factors
 Smoking: never smoker 265 (54%) 211 (52%) 54 (64%) 0.04
 Alcohol: > 2 drinks/week 122 (25%) 118 (29%) 4 (5%) < .0001
 Diet: very good/excellent diet 264 (54%) 239 (59%) 25 (30%) < .0001
 Physical activity: sedentary 236 (49%) 184 (47%) 52 (60%) 0.02
Socioeconomic factors
 Education: < college education 85 (18%) 54 (14%) 31 (38%) < .0001
 Income: < $75,000/year 70 (40%) 43 (31%) 27 (75%) < .0001
 Insurance: commercial insurance 436 (89%) 364 (90%) 72 (84%) 0.1