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Table 1 Characteristics of postmenopausal cases and controls

From: Body size, modifying factors, and postmenopausal breast cancer risk in a multiethnic population: the San Francisco Bay Area Breast Cancer Study

 

Cases (n = 1,316)

Controls (n = 1,568)

P value

 

n

%a

n

%a

 

Age (years)

     

 35–44

20

2

25

2

 

 45–54

199

15

260

17

 

 55–64

531

40

625

40

 

 65–74

407

31

509

33

 

 ≥75

159

12

149

10

 

Race/ethnicity

     

 Hispanic

614

47

804

51

 

 Non-Hispanic White

389

30

399

26

 

 African American

313

24

365

23

 

Joint ER/PR status

     

 ER+PR+

714

54

   

 ER+PR-

168

13

   

 ER-PR+

21

2

   

 ER-PR-

204

16

   

 Missing

209

16

   

Menopausal hormone therapy use

    

<0.01

 Never

517

39

644

41

 

 Former

284

22

692

44

 

 Current

498

38

214

14

 

 Missing

17

1

18

1

 

Place of birth

    

<0.01

 U.S.-bornb

1,014

77

1,036

66

 

 Foreign-born

302

23

532

34

 

Education (years)

    

<0.01

 Some high school or less

398

30

600

38

 

 High school or vocational/technical school graduate

373

28

426

27

 

 Some college

297

23

297

19

 

 College graduate

248

19

245

16

 

Family history of breast cancer in first-degree relatives

    

<0.01

 No

1,089

83

1,371

87

 

 Yes

227

17

197

13

 

Personal history of biopsy-confirmed benign breast disease

    

0.01

 No

1,016

77

1,274

81

 

 Yes

300

23

294

19

 

Age at menarche

    

<0.01

 ≤11

304

23

327

21

 

 12

349

27

356

23

 

 13

319

24

387

25

 

 ≥14

344

26

498

32

 

Parity

    

<0.01

 Nulliparous

169

13

145

9

 

 Parous

1,147

87

1,423

91

 

Number of full-term pregnancies, parous women

    

<0.01

 1

162

14

177

12

 

 2

309

27

303

21

 

 3

263

23

349

25

 

 ≥4

413

36

594

42

 

Age at first full-term pregnancy (years), parous women

    

<0.01

 ≤19

302

26

415

29

 

 20–24

462

40

564

40

 

 25–29

235

21

298

21

 

 ≥30

148

13

146

10

 

Lifetime breast-feeding (months), parous women

    

<0.01

 0

541

47

547

38

 

 ≤ 6

250

22

294

21

 

 7–12

97

8

148

10

 

 13–24

126

11

184

13

 

 ≥25

133

12

250

18

 

Lifetime physical activityc (hours/week)

    

0.04

 ≤ 6.9

376

29

391

25

 

 7.0-14.1

342

26

390

25

 

 14.2-25.4

291

22

403

26

 

 ≥25.5

307

23

384

25

 

Alcohol consumptiond,e (g/day)

    

<0.01

 0

763

58

975

62

 

 0.1-4.9

262

20

312

20

 

 5.0-9.9

68

5

91

6

 

 10.0-19.9

115

9

107

7

 

 ≥20

108

8

83

5

 

Total caloric intakec,d,e (kcal/day)

    

0.05

 ≤ 1362

287

22

394

25

 

 1363–1798

343

26

385

25

 

 1799–2435

379

29

398

25

 

 ≥2436

307

23

391

25

 
  1. Abbreviations: ER-, estrogen receptor–negative; ER+, estrogen receptor–positive; PR-, progesterone receptor–negative; PR+, progesterone receptor–positive.
  2. a Percentages may not add up to 100% due to rounding.
  3. b U.S.-born includes 43 cases and 34 controls born in westernized countries such as Canada, Europe, Australia, or New Zealand.
  4. c Quartiles among all postmenopausal controls.
  5. d In reference year.
  6. e Excludes 39 cases and 26 controls whose total caloric intake was <600 kcal/day or >5,000 kcal/day.