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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.