Table 1b Characteristics of 19 772 women in the HUNT2 study with at least two measures of body weight before start of follow-up at age 55 or older, by weight change between examinations
From: Weight change in adulthood and risk of postmenopausal breast cancer: the HUNT study of Norway
Weight loss | Stable weight | Weight gain | |||
|---|---|---|---|---|---|
Characteristic a | >2.5 kg per 10 years | 2.5–2.49 kg per 10 years | 2.5–4.99 kg per 10 years | 5.0–7.49 kg per 10 years | ⩾7.5 kg per 10 years |
Number of women | 1625 | 8075 | 4648 | 2756 | 2668 |
Person-years | 13 427 | 79 926.4 | 44 909.6 | 24 217.4 | 19 857.5 |
Cases of incident breast cancer | 31 | 187 | 113 | 72 | 68 |
Age at first survey, mean (s.d.) | 47.7 (11.7) | 39.2 (11.3) | 34.5 (10.2) | 33.2 (9.4) | 34.0 (8.9) |
Age at HUNT2, mean (s.d.) | 71.1 (12.7) | 64.3 (12) | 58.4 (10.5) | 54.6 (9.2) | 51.6( 8.3) |
BMI (kg m−2) at first survey, mean (s.d.) | 27.9 (4.7) | 24.8(3.8) | 23.6(3.4) | 23.3(3.3) | 24(3.7) |
BMI (kg m−2) at HUNT2 survey, mean (s.d.) | 24.6 (4.5) | 25.7 (4) | 27.1 (3.9) | 28.3 (4.0) | 31 (5.1) |
Body weight (kg) at first survey, mean (s.d.) | 73.2 (12.8) | 65.8 (10.3) | 63.2 (9.5) | 63.1 (9.4) | 65.5 (10.4) |
Height (cm), mean (s.d.) | 159.3 (6.8) | 161.3 (6.2) | 163.1 (5.9) | 164.1 (5.7) | 164.9 (5.6) |
Age at menarche, mean (s.d.) | 13.8 (1.5) | 13.7 (1.6) | 13.6 (1.4) | 13.4 (1.4) | 13.2 (1.4) |
Numbers missing (% of group total) | 11.4 | 6.4 | 3.7 | 4.1 | 3.6 |
Age at first birth among parous women, mean (s.d.) | 24.8 (4.8) | 24.0 (4.4) | 23.2 (4.1) | 22.9 (4.0) | 22.7 (3.9) |
Numbers missing (% of group total) | 245 (15) | 934 (12) | 518 (11) | 318 (12) | 287 (11) |
Parity, % | |||||
Nulliparous | 11 | 8 | 6 | 7 | 6 |
1–2 children | 36 | 38 | 38 | 42 | 45 |
⩾3 children | 53 | 55 | 56 | 52 | 49 |
Numbers missing (% of group total) | 70 (4) | 329 (4) | 240 (5) | 145 (5) | 138 (5) |
Use of HRT at HUNT2, % | |||||
Current | 10 | 17 | 19 | 16 | 14 |
Former | 4 | 6 | 7 | 8 | 7 |
Never | 86 | 77 | 74 | 76 | 79 |
Numbers missing (% of group total) | 605 (37) | 2673 (33) | 1192 (26) | 635 (23) | 530 (20) |
