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Table 1 Descriptive characteristics of African-American and European-American women by case-control status in the Women's Circle of Health Study

From: Variants in the vitamin D pathway, serum levels of vitamin D, and estrogen receptor negative breast cancer among African-American women: a case-control study

  African-American European-American
Characteristics Case
(n= 547)
Control
(n = 461)
P value Case
(n = 381)
Control
(n = 382)
P value
  Mean (SD) Mean (SD)   Mean (SD) Mean (SD)  
Age, years 51.7 (10.0) 49.8 (9.9) 0.003 51.0 (8.4) 50.9 (8.3) 0.82
Body mass index, kg/m2 31.2 (6.7) 31.6 (7.8) 0.48 26.8 (5.8) 27.7 (7.1) 0.06
Percentage with European ancestry 0.09 (0.15) 0.10 (0.16) 0.19 0.98 (0.07) 0.99 (0.03) 0.07
  Count (%) Count (%)   Count (%) Count (%)  
Menopausal status    0.14    0.17
   Pre-menopausal 337 (61.6) 263 (57.0)   235 (61.7) 217 (56.8)  
   Post-menopausal 210 (38.4) 198 (43.0)   146 (38.3) 165 (43.2)  
Family history    0.13    0.001
   Yes 82 (15.0) 54 (11.7)   104 (27.3) 67 (17.5)  
   No 465 (85.0) 407 (88.3)   277 (72.7) 315 (82.5)  
Education    0.06    < 0.001
   Less than high school 76 (13.9) 55 (11.9)   9 (2.4) 4 (1.1)  
   High school 175 (32.0) 122 (26.5)   80 (21.0) 44 (11.5)  
   College or above 296 (54.1) 284 (61.6)   292 (76.6) 334 (87.4)  
Hormone replacement therapy    0.74    0.47
   Yes 79 (14.5) 62 (14.2)   96 (25.3) 88 (23.0)  
   No 464 (85.5) 397 (85.8)   284 (74.7) 294 (77.0)  
  1. For continuous variables, P values were based on the t test; for categorical variables, P values were based on the chi-squared test. Owing to occasional missing values, the counts of some variables did not add up to the total. SD, standard deviation.