Table 1 Characteristics of the study participants at the baseline health screening examination (N = 1,142,643).
From: Risk of non-Hodgkin lymphoma in breast cancer survivors: a nationwide cohort study
Characteristics | No breast cancer (N = 1,057,674) | Incident breast cancer (N = 84,969) |
|---|---|---|
Age at baseline, years | 46 (40–54) | 46 (40–53) |
Age at menarche, years | ||
<10 | 2660 (0.3) | 394 (0.5) |
10–13 | 73,185 (6.9) | 7025 (8.3) |
14–16 | 482,512 (45.6) | 41,278 (48.6) |
≥17 | 398,988 (37.7) | 27,696 (32.6) |
Unknown | 100,329 (9.5) | 8578 (10.1) |
Menopause status | ||
Pre-menopause | 404,672 (38.3) | 30,291 (35.7) |
Post-menopause | 556,829 (52.7) | 46,501 (54.7) |
Missing data | 96,163 (9.1) | 8177 (9.6) |
BMI, kg/m2 | ||
Underweight (<18) | 38,847 (3.7) | 3035 (3.6) |
Normal (18 to <23) | 474,009 (44.8) | 37,724 (44.4) |
Overweight (23 to <25) | 243,220 (23.0) | 19,577 (23.0) |
Obese (≥25) | 301,127 (28.5) | 24,604 (29.0) |
Missing data | 471 (0.0) | 29 (0.0) |
Alcohol consumption | ||
None | 713,524 (67.5) | 58,034 (68.3) |
Moderate (1–19 g/day) | 275,882 (26.1) | 21,469 (25.3) |
Heavy (≥20 g/day) | 20,848 (2.0) | 1497 (1.8) |
Missing | 47,420 (4.5) | 3978 (4.7) |
Smoking status | ||
Never smoker | 946,369 (89.5) | 75,647 (89.0) |
Ever smoker | 58,619 (5.5) | 4767 (5.6) |
Missing data | 52,686 (5.0) | 4555 (5.4) |
Moderate–vigorous physical activity | ||
None | 610,131 (57.7) | 48,480 (57.1) |
1–2 times per week | 204,126 (19.3) | 16,719 (19.7) |
≥3 times per week | 195,661 (18.5) | 15,701 (18.5) |
Missing | 47,756 (4.5) | 4069 (4.8) |
Income percentile | ||
Medical Aid | 19,753 (1.9) | 1480 (1.7) |
≤30th | 304,541 (28.8) | 23,692 (27.9) |
31st–70th | 357,873 (33.8) | 28,465 (33.5) |
>70th | 375,507 (35.5) | 31,332 (36.9) |
