Table 1.
Baseline characteristics by height and follow-up for incident cancer in the Million Women Study
|
Height in cm* |
All women | |||||||
|---|---|---|---|---|---|---|---|---|
| <155 | 155 | 160 | 165 | 170 | ≥175 | |||
| Mean measured height (SD) | 152·8 (4·1) | 156·5 (2·3) | 160·4 (2·9) | 164·9 (2·9) | 169·0 (2·9) | 173·8 (4·3) | 160·9 (6·4)† | |
| Characteristics at recruitment | ||||||||
| Number of women | 233 516 | 196 773 | 388 515 | 288 893 | 143 289 | 46 138 | 1 297 124 | |
| Mean age, years (SD) | 56·3 (4·9) | 56·2 (4·9) | 56·2 (4·9) | 56·0 (4·8) | 56·0 (4·8) | 55·8 (4·8) | 56·1 (4·9) | |
| Socioeconomic status, n (%) in lowest quintile | 59 220 (26%) | 42 862 (22%) | 73 119 (19%) | 48 190 (17%) | 23 262 (16%) | 7 664 (17%) | 19·7 | |
| Current smokers, n (%) | 50 775 (23%) | 40 500 (22%) | 72 763 (20%) | 51 678 (19%) | 26 147 (19%) | 8 369 (19%) | 20·5 | |
| Alcohol intake, n (%) ≥7 units per week | 47 138 (20%) | 43 324 (22%) | 92 126 (24%) | 73 597 (26%) | 36 742 (26%) | 11 734 (26%) | 23·7 | |
| Body-mass index, n (%) BMI ≥30 | 54 550 (25%) | 38 493 (20%) | 65 622 (18%) | 42 004 (15%) | 18 370 (13%) | 5 320 (12%) | 18·0 | |
| Strenuous exercise, n (%) once a week or more | 76 917 (35%) | 69 607 (37%) | 147 103 (39%) | 116 614 (42%) | 58 339 (42%) | 18 699 (42%) | 39·0 | |
| Age at menarche, n (%) ≥14 years | 79 858 (35%) | 69 718 (36%) | 139 607 (37%) | 108 550 (38%) | 57 852 (41%) | 20 176 (45%) | 37·4 | |
| Parity, n (%) nulliparous | 22 827 (10%) | 19 149 (10%) | 40 296 (10%) | 33 267 (12%) | 17 985 (13%) | 6 900 (15%) | 10·8 | |
| Number of full-term pregnancies, n (%) with three or more | 82 436 (35%) | 67 118 (34%) | 127 826 (33%) | 91 287 (32%) | 44 074 (31%) | 13 335 (29%) | 32·9 | |
| Age at first birth, n (%) ≥25 years | 67 250 (33%) | 61 042 (35%) | 129 031 (38%) | 103 017 (41%) | 52 677 (43%) | 17 492 (46%) | 38·2 | |
| Postmenopausal, n (%) | 162 551 (81%) | 136 544 (81%) | 269 384 (81%) | 197 618 (80%) | 97 855 (80%) | 30 900 (79%) | 80·5 | |
| Ever use of oral contraceptives, n (%) | 133 979 (58%) | 114 105 (59%) | 228 669 (60%) | 173 520 (61%) | 85 522 (60%) | 27 571 (60%) | 59·5 | |
| Current use of HRT, n (%) | 75 151 (33%) | 63 865 (33%) | 128 891 (34%) | 98 086 (34%) | 48 516 (34%) | 15 637 (34%) | 33·6 | |
| Follow-up for cancer incidence | ||||||||
| Woman-years, millions | 2·1 | 1·8 | 3·5 | 2·6 | 1·3 | 0·4 | 11·7 | |
| Number of incident cancers | 15 792 | 14 213 | 28 806 | 22 571 | 11 902 | 4 092 | 97 376 | |
*
The categories of height are those reported at recruitment, and mean values are those measured in a randomly selected sample.
†
Standardised to the distribution of categories of self-reported height in our whole analysis population.