Study characteristics | Controls | Cases | ||
---|---|---|---|---|
2096 | % | 1071 | % | |
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 |