Table 1.
Baseline Characteristics of Postmenopausal Women in the Million Women Study by Height and Follow‐up for Incident Fracture a
| Height (cm) | ||||||
|---|---|---|---|---|---|---|
| <155 | 155−159 | 160−164 | 165−169 | 170+ | All women | |
| Characteristics at study baseline | n = 132,636 | n = 116,428 | n = 240,168 | n = 185,015 | n = 121,834 | n = 796,081 |
| Mean age, years (SD) | 59.6 (5.0) | 59.5 (4.9) | 59.5 (4.9) | 59.3 (4.9) | 59.2 (4.8) | 59.4 (4.9) |
| Mean height at recruitment, cm (SD) | 152.4 (3.2) | 157.5 (0.0) | 161.5 (1.3) | 166.4 (1.2) | 172.6 (3.0) | 162.2 (6.6) |
| Mean measured height, cm (SD) | 152.7 (3.6) | 156.5 (2.3) | 160.4 (2.9) | 164.9 (2.8) | 170.1 (3.8) | 161.5 (6.3) |
| Mean weight, kg (SD) | 63.3 (11.5) | 65.9 (11.6) | 68.2 (11.7) | 70.9 (11.9) | 75.1 (12.7) | 68.7 (12.4) |
| Mean BMI, kg/m2 (SD) | 27.1 (5.0) | 26.5 (4.6) | 26.1 (4.5) | 25.5 (4.3) | 25.2 (4.2) | 26.0 (4.5) |
| Mean alcohol, g/d (SD) | 6.6 (14.3) | 6.9 (14.1) | 7.3 (14.0) | 7.7 (13.9) | 7.8 (14.2) | 7.3 (14.1) |
| Mean no. of children at recruitment (SD) | 2.2 (1.2) | 2.1 (1.2) | 2.1 (1.2) | 2.1 (1.2) | 2.0 (1.2) | 2.1 (1.2) |
| Prior fracture (%) | 8.3 | 8.1 | 8.3 | 8.5 | 9.2 | 8.5 |
| Prior osteoporosis (%) | 6.9 | 5.7 | 5.3 | 4.9 | 4.7 | 5.5 |
| One or more fall in the past year (%) b | 20.1 | 19.5 | 19.6 | 20.2 | 20.7 | 20.0 |
| Diabetes (%) | 4.6 | 4.1 | 3.6 | 3.2 | 3.3 | 3.7 |
| Current smoker (%) | 13.7 | 13.1 | 11.8 | 11.4 | 11.6 | 12.2 |
| Socioeconomic status: lowest fifth (%) | 21.6 | 18.6 | 16.0 | 14.3 | 14.1 | 16.6 |
| Ever users of menopausal hormones (%) | 53.7 | 53.6 | 54.2 | 54.7 | 54.3 | 54.2 |
| Nulliparous (%) | 10.3 | 10.1 | 10.7 | 11.8 | 13.6 | 11.2 |
| No strenuous activity (%) | 63.3 | 61.8 | 59.9 | 58.3 | 58.7 | 60.2 |
| No physical activity (%) | 30.4 | 29.5 | 29.4 | 29.7 | 30.1 | 29.8 |
| Follow‐up for fracture incidence | ||||||
| Woman‐years of follow‐up (in thousands) | 1111 | 982 | 2029 | 1565 | 1031 | 6717 |
| All incident fractures (n) | 4246 | 3802 | 8235 | 6870 | 5278 | 28,431 |
| Arm | ||||||
| Humerus (n) | 494 | 418 | 870 | 732 | 522 | 3036 |
| Radius and ulna (without wrist) (n) | 249 | 242 | 465 | 452 | 367 | 1775 |
| Wrist (n) | 1471 | 1259 | 2879 | 2313 | 1762 | 9684 |
| Leg | ||||||
| Neck of femur (n) | 730 | 671 | 1598 | 1462 | 1273 | 5734 |
| Femur (not neck) (n) | 135 | 125 | 170 | 167 | 116 | 713 |
| Patella (n) | 85 | 101 | 176 | 163 | 124 | 649 |
| Tibia and fibula (without ankle) (n) | 300 | 260 | 514 | 424 | 313 | 1811 |
| Ankle (n) | 865 | 771 | 1631 | 1306 | 950 | 5523 |
| Other | ||||||
| Clavicle, spine and rib (n) | 340 | 299 | 654 | 499 | 382 | 2174 |
a
Women with missing values were excluded when calculating the means or percentages for that given variable.
b
Among 470,066 women who reported on falls 4 years after study baseline; the percent that reported one or more falls in the previous year.