Table 2.

Body size and shape in different periods of life in the Women's Lifestyle and Health Study

CharacteristicsStudy Population, No. (%)Breast Cancer Cases, No. (%)
Perceived body shape at age 7
    Very thin11,272 (11.5)92 (12.9)
    Thin23,042 (23.6)164 (23.0)
    Average54,364 (55.7)411 (57.6)
    Fat/very fat8,997 (9.2)46 (6.5)
Mean (SD) adult height166.3 (5.7)167.0 (5.6)
BMI (kg/m2) at age 18
    <2041,091 (44.2)330 (47.9)
    20-24.947,329 (50.9)327 (47.5)
    ≥254,531 (4.9)32 (4.6)
Mean (SD) weight at cohort enrolment64.1 (10.3)63.4 (10.1)
BMI (kg/m2) at cohort enrolment
    <2013,494 (13.9)123 (17.2)
    20-24.961,474 (63.4)466 (65.1)
    25-29.917,411 (18.0)104 (14.5)
    ≥304,607 (4.7)23 (3.2)
Mean (SD) BMI at cohort enrolment23.2 (3.5)22.7 (3.3)
Difference in body size and shape between age 7 and adulthood*
    Remained thin6,260 (6.7)54 (7.9)
    Decreased weight19,939 (21.3)156 (22.6)
    Remained at average weight22,464 (24.0)178 (25.8)
    Increased weight43,153 (46.2)294 (42.7)
    Remained fat1,716 (1.8)7 (1.0)
Adult BMI change (difference between age 18 and 1 year before recruitment)
    Decreased17,623 (19.2)140 (20.6)
    Increased 0-1.416,217 (17.6)131 (19.3)
    Increased 1.5-4.034,158 (37.1)259 (38.1)
    Increased >4.024,047 (26.1)150 (22.0)