Table 1. Prevalence of characteristics at baseline across quartiles of DII in the SWLH study.
|
DIIa |
||||
|---|---|---|---|---|
| Characteristicsb (mean (s.d.) or %) | Quartile 1 <1.87 Median=1.01 N=11 314 | Quartile 2 1.87–2.92 Median=2.45 N=11 315 | Quartile 3 2.93–3.77 Median=3.36 N=11 313 | Quartile 4 >3.77 Median=4.24 N=11 315 |
| Breast cancer cases (%) | 454 (4.0) | 493 (4.4) | 468 (4.1) | 480 (4.2) |
|
Stage of breast cancer | ||||
| In situ | 64 (14.4) | 69 (15.1) | 69 (16.1) | 66 (14.0) |
| Invasive | 390 (85.6) | 424 (84.9) | 399 (83.9) | 414 (85.0) |
| Age (years) | 40.4 (5.7) | 40.3 (5.7) | 40.2 (5.7) | 40.3 (5.8) |
| Age at menarche (years) | 12.9 (1.4) | 12.9 (1.3) | 13.0 (1.3) | 13.0 (1.3) |
| Total energy intake (kcal per day) | 1924 (409) | 1655 (356) | 1462 (332) | 1193 (344) |
| PUFA (g per day) | 9.6 (3.1) | 8.1 (2.4) | 7.1(2.1) | 5.7 (2.0) |
| Dietary fibre (g per day) | 19.6 (4.5) | 15.0 (2.9) | 12.4 (2.6) | 9.4 (2.7) |
| BMI (kg m−2) | 23.6 (3.7) | 23.5 (3.7) | 23.4 (3.6) | 23.4 (3.7) |
|
Education (%) | ||||
| Low | 37.4 | 41.4 | 45.9 | 53.0 |
| High | 62.6 | 58.6 | 54.1 | 47.0 |
|
Smoking (%) | ||||
| Never | 47.5 | 43.2 | 39.6 | 34.2 |
| Former | 36.9 | 37.4 | 38.1 | 37.4 |
| Current | 15.6 | 19.4 | 22.3 | 28.4 |
| Multivitamin use (%) | 18.3 | 16.0 | 14.0 | 11.0 |
| Oral contraceptive use (yes) (%) | 60.4 | 61.0 | 60.9 | 59.3 |
|
Age at first birth (years) and total number of children at baseline | ||||
| Parity | ||||
| No children | 9.1 | 8.9 | 9.7 | 11.3 |
| <30, 1 child | 4.4 | 4.9 | 5.2 | 6.3 |
| <30, 2 children | 25.9 | 28.1 | 29.5 | 26.8 |
| <30, ⩾3 children | 26.4 | 24.8 | 23.0 | 21.6 |
| ⩾30, 1 child | 7.9 | 7.5 | 8.2 | 9.2 |
| ⩾30, 2 children | 17.2 | 17.4 | 16.4 | 16.5 |
| ⩾30, ⩾3 children | 9.1 | 8.3 | 8.2 | 8.4 |
|
Physical activity (%) | ||||
| Sitting only/sedentary | 2.8 | 3.2 | 4.2 | 6.6 |
| Walking only | 65.8 | 69.8 | 72.3 | 73.1 |
| Moderate | 20.2 | 18.3 | 15.5 | 13.9 |
| Vigorous | 11.2 | 8.7 | 7.9 | 6.4 |
Abbreviations: DlI=dietary inflammatory index; N=number of women; PUFA=polyunsaturated fatty acid; SWLH=The Swedish cohort Women Lifestyle and Health.
a
Quartile 1 refers to scores indicating anti-inflammatory diet and quartile 4 refers to scores indicating a proinflammatory diet.
b
All variables are at baseline. Some column percentages are presented; they do not always add to 100 because of rounding.