Table 1 Demographic and reproductive characteristics of breast cancer cases and controls, 2009–2011
From: The association between different night shiftwork factors and breast cancer: a case–control study
% Controls (n =1785) | % Cases (n =1202) | |
|---|---|---|
Age group (years) | ||
24–44 | 10.0 | 14.0 |
45–49 | 11.4 | 14.6 |
50–54 | 13.3 | 12.7 |
55–59 | 17.1 | 15.3 |
60–64 | 18.0 | 16.0 |
65–69 | 15.2 | 12.2 |
70–80 | 15.0 | 15.3 |
Status at recruitment | ||
Postmenopausal | 76.5 | 69.6 |
Premenopausal | 23.5 | 30.4 |
Socioeconomic score a | ||
Advantaged | 5.1 | 4.5 |
2 | 13.7 | 12.7 |
3 | 20.8 | 19.5 |
4 | 20.1 | 20.5 |
Disadvantaged | 40.2 | 42.9 |
Remoteness score | ||
Highly accessible | 84.6 | 85.7 |
Less accessible/remote | 15.4 | 14.3 |
Education | ||
Junior school | 36.0 | 36.1 |
Senior school | 22.6 | 20.6 |
Trade/apprenticeship | 24.4 | 21.5 |
University | 17.0 | 21.8 |
Country of birth | ||
Australia/New Zealand | 66.6 | 63.7 |
United Kingdom/Ireland | 21.6 | 21.7 |
Other Europe | 4.7 | 5.4 |
Asia | 3.7 | 5.3 |
Other | 3.4 | 3.8 |
Family history of breast cancer | ||
None | 71.6 | 60.6 |
Some family history | 20.9 | 25.0 |
Clear high risk | 7.3 | 14.1 |
Unknown or missing | 0.2 | 0.3 |
No. of children | ||
0 | 10.5 | 13.1 |
1 | 7.7 | 9.6 |
2 | 38.9 | 38.2 |
3 | 27.2 | 25.1 |
4+ | 15.7 | 14.1 |
Breastfeeding b | ||
No children | 10.5 | 13.1 |
No breastfeeding | 8.6 | 10.5 |
Breastfed⩽12 months | 35.6 | 32.8 |
Breastfed>12 months | 43.2 | 42.2 |
Alcohol intake c, d | ||
None | 15.9 | 16.8 |
⩽3 drinks per week | 36.3 | 34.6 |
4–9 drinks per week | 21.2 | 22.3 |
10+ drinks per week | 26.2 | 26.1 |
Physical activity d, e | ||
0–37 | 24.7 | 24.7 |
38–58 | 25.2 | 24.7 |
59–85 | 25.1 | 26.2 |
86+ | 25.0 | 24.4 |
BMI in 30s f | ||
Underweight | 8.8 | 8.0 |
Healthy | 70.8 | 72.5 |
Overweight | 15.2 | 13.8 |
Obese | 5.2 | 5.7 |
Circadian type g | ||
Evening type | 20.0 | 20.6 |
Neutral type | 51.8 | 49.4 |
Morning type | 27.3 | 28.6 |
Circadian rhythm h | ||
Vigorous | 19.0 | 19.8 |
Neutral | 48.4 | 50.7 |
Languid | 31.9 | 28.6 |
Circadian flexibility i | ||
Rigid | 21.6 | 22.8 |
Neutral | 52.9 | 51.1 |
Flexible | 24.9 | 25.1 |
