Table 1 Descriptive characteristics of 1071 invasive breast cancer cases and 2096 controls and mosquito control methods in the Ghana Breast Health Study

Age

 < 35

435

21

107

10

 35–44

561

27

265

25

 45–55

554

26

312

29

 55+

546

26

387

36

Recruitment city

 Accra

728

35

374

35

 Kumasi

1368

65

697

65

Education

 No formal education

498

24

238

24

 Primary school

369

18

146

15

 Junior secondary school

654

32

245

24

 > Senior secondary school

512

25

375

37

 Unknown

73

67

Family history of breast cancer

 No

2036

98

985

93

 Yes

46

2

72

7

 Unknown

24

14

1

Age at menarche (years)

 < 15

568

30

258

28

 15

548

29

238

26

 16

383

20

212

23

 > 17

395

21

213

23

 Unknown

212

150

Body size

 Slight

585

29

243

24

 Average

827

40

413

41

 Slightly heavy

470

23

249

25

 Heavy

163

8

99

10

 Unknown

61

67

 Parity

Median among parous (IQR)

4 (2–5)

3 (2–5)

 Nulliparous

228

11

101

9

 1–2

528

25

302

27

 3–4

683

32

349

31

  > 5

649

31

315

28

 Unknown

8

4

 Age at first birth

Median years (IQR)

20 (18–24)

21 (19–25)

 < 18

552

31

229

25

 19–21

509

28

253

28

 22–25

411

23

244

27

 26+

322

18

190

21

Breastfeeding years (among parous women)

Median years (IQR)

5 (3.0–8.0)

4.4 (2.6–7.5)

 Never

31

2

165

16

 < 1

47

3

41

4

 1– < 3

360

20

184

17

 3– < 5

440

24

246

23

 5– < 10

618

34

299

28

 ≥ 10

321

18

117

11

 Unknown

61

60

 Median breastfeeding/pregnancy (months)

Median months (IQR)

18 (15–24)

18 (12–24)

 ≤ 12

352

20

232

26

 13–18

692

39

333

38

 > 18

747

42

320

36

 Unknown

87

144

Menopausal status

 Premenopausal

1276

61

468

44

 Postmenopausal

816

39

601

56

 Unknown

14

2

 Age at menopause

Median years (IQR)

49 (45–51)

49 (45–51)

 < 45

119

18

81

17

 45–49

222

33

156

33

 50–54

267

39

183

39

 ≥ 55

68

10

53

11

 Unknown

147

130

Insecticide-treated net

 No

909

44

484

45

 Yes

1175

56

581

55

 Unknown

12

6

Repellent room spray

 No

980

47

398

37

 Yes

1101

53

667

63

 Unknown

15

6

Repellent skin cream

 No

1750

85

867

82

 Yes

321

15

188

18

 Unknown

25

16

Mosquito coil

 No

736

35

419

39

 Yes

1344

65

644

61

 Unknown

16

8

Other mosquito control products

 No

1995

98

1028

99

 Yes

32

2

13

1

 Unknown

69

30

Single use mosquito control product categories

 No reported use of any insecticide vector control product

191

9

77

7

 Ever use insecticide-treated net only

218

10

117

11

 Ever use repellent room spray only

131

6

110

10

 Ever use repellent skin cream only

10

0

3

0

 Ever use mosquito coil only

216

10

78

7

 Use of multiple mosquito control products

1330

63

686

64

Any combination use of mosquito control products

 Ever use any combination of insecticide-treated net with other insecticide products

1175

56

581

54

 Ever use any combination of repellent room spray with other insecticide products

1101

53

667

63

 Ever use any combination of repellent skin cream with other insecticide products

321

15

188

18

 Ever use any combination of mosquito coil with other insecticide products

1344

65

644

61