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Table 1 Study population characteristics for 5,134 Danish women by BMI. Danish Diet, Cancer, and Health Cohort (1993–2008)

From: Body mass index and participation in organized mammographic screening: a prospective cohort study

  Body mass index*
Characteristics Total Underweight Normal Overweight Obese I Obese II Obese III
N women 5,134 74 2,381 1,772 657 182 68
N (%) non-participants in screening 557 (10.9) 17 (23.0) 285 (12.0) 152 (8.6) 62 (9.4) 28 (15.4) 13 (19.1)
N (%) Previously screened 3,914 (76.2) 59 (79.7) 1,750 (73.5) 1,387 (78.3) 517 (78.7) 149 (81.9) 52 (76.5)
Mean (SD) BMI, kg/m2 26.0 (4.7) 17.5 (0.9) 22.4 (1.6) 27.1 (1.4) 31.8 (1.3) 37.2 (1.4) 43.2 (3.6)
Mean (SD) birth cohort, year 1938 (4.5) 1936 (4.7) 1938 (4.5) 1937 (4.6) 1937 (4.5) 1937 (4.5) 1938 (4.6)
Mean (SD) age at screening, years 56.4 (4.5) 57.7 (4.6) 55.9 (4.4) 56.8 (4.5) 56.8 (4.5) 57.2 (4.4) 56.5 (4.5)
Mean (SD) age at menarche, years 13.6 (1.7) 14.1 (1.6) 13.8 (1.6) 13.5 (1.7) 13.3 (1.7) 13.4 (1.9) 13.1 (2.0)
Mean (SD) age at first birth, years 22.6 (4.2) 23.1 (4.0) 23.2 (4.1) 22.3 (4.2) 22.2 (4.4) 21.5 (3.7) 22.1 (3.7)
Mean (SD) age at menopause, years 48.4 (5.6) 45.9 (7.2) 48.5 (5.5) 48.4 (5.6) 48.6 (5.5) 49.0 (5.2) 47.4 (5.7)
N (%) basis school 1,194 (23.3) 14 (18.9) 460 (19.3) 438 (24.7) 206 (31.4) 57 (31.3) 19 (27.9)
N (%) higher education, 1–2 years 2,053 (40.0) 35 (47.3) 961 (40.4) 714 (40.3) 245 (37.3) 67 (36.8) 31 (45.6)
N (%) higher education, 3–4 years 1,228 (23.9) 15 (20.3) 586 (24.6) 424 (23.9) 144 (21.9) 46 (25.3) 13 (19.1)
N (%) higher education, ≥5 y. 659 (12.8) 10 (13.5) 374 (15.7) 196 (11.1) 62 (9.4) 12 (6.6) 5 (7.4)
N (%) postmenopausal 4,114 (80.1) 61 (82.4) 1,854 (77.9) 1,459 (82.3) 537 (81.7) 153 (84.1) 50 (73.5)
N (%) ever used HRT 2,097 (40.8) 32 (43.2) 976 (41.0) 775 (43.7) 245 (37.3) 54 (29.7) 15 (22.1)
N (%) nulliparous 549 (10.7) 15 (20.3) 269 (11.3) 183 (10.3) 59 (9.0) 15 (8.2) 8 (11.8)
N (%) 1–2 children 2,034 (39.6) 32 (43.2) 991 (41.6) 682 (38.5) 233 (35.5) 70 (38.5) 26 (38.2)
N (%) 3–4 children 1,925 (37.5) 19 (25.7) 882 (37.1) 683 (38.6) 248 (37.7) 72 (39.6) 21 (30.9)
N (%) ≥5 children 626 (12.2) 8 (10.8) 239 (10.0) 224 (12.6) 117 (17.8) 25 (13.7) 13 (19.1)
N (%) ever breastfed 4,228 (82.4) 53 (71.6) 1,945 (81.7) 1,494 (84.3) 538 (81.9) 150 (82.4) 48 (70.6)
N (%) ever used oral contraceptives 2,832 (55.2) 38 (51.4) 1,359 (57.1) 989 (55.8) 334 (50.8) 84 (46.2) 28 (41.2)
N (%) never smokers 1,913 (37.3) 16 (21.6) 796 (33.4) 688 (38.8) 297 (45.2) 86 (47.3) 30 (44.1)
N (%) current smokers 2,083 (40.5) 49 (66.2) 1,088 (45.7) 651 (36.7) 224 (34.1) 47 (25.8) 24 (35.3)
N (%) past smokers 1,138 (22.2) 9 (12.2) 497 (20.9) 433 (24.5) 136 (20.7) 49 (26.9) 14 (20.6)
N (%) alcohol abstainers 228 (4.4) 4 (5.4) 101 (4.2) 61 (3.4) 34 (5.2) 16 (8.8) 12 (17.6)
N (%) alcohol occasionally, monthly 1,607 (31.3) 23 (31.1) 645 (27.1) 559 (31.6) 261 (39.7) 89 (48.9) 30 (44.1)
N (%) alcohol ≤ 4 units/week 2,165 (42.2) 24 (32.4) 1,028 (43.2) 778 (43.9) 256 (39.0) 58 (31.9) 21 (30.9)
N (%) alcohol ≥ 5 units/week 1,134 (22.1) 23 (31.1) 607 (25.5) 374 (21.1) 106 (16.1) 19 (10.4) 5 (7.4)
N (%) participates in sport, weekly 2,543 (49.5) 29 (39.2) 1,251 (52.5) 892 (50.3) 276 (42.0) 69 (37.9) 26 (38.2)
N (%) angina pectoris 132 (2.6) 2 (2.7) 40 (1.7) 54 (3.0) 30 (4.6) 4 (2.2) 2 (2.9)
N (%) diabetes 92 (1.8) 0 (0.0) 25 (1.0) 25 (1.4) 28 (4.3) 8 (4.4) 6 (8.8)
N (%) hypercholesterolemia 307 (6.0) 4 (5.4) 113 (4.8) 116 (6.6) 53 (8.1) 16 (8.8) 5 (7.4)
N (%) hypertension 964 (18.8) 12 (16.2) 311 (13.1) 354 (20.0) 185 (28.2) 75 (41.2) 27 (39.7)
N (%) myocardial infarction 58 (1.1) 3 (4.0) 17 (0.7) 22 (1.2) 11 (1.7) 2 (1.1) 3 (4.4)
N (%) stroke 69 (1.3) 5 (6.8) 16 (0.7) 32 (1.8) 9 (1.4) 5 (2.7) 2 (2.9)
  1. *Underweight (<18.5 kg/m2), normal weight (18.5-24.9 kg/m2), overweight (25.0-29.9 kg/m2), Obese class I (30.0-34.9 kg/m2), Obese class II (35.0-39.9 kg/m2), Obese class III (≥40.0 kg/m2). HRT – hormone replacement therapy; BMI – body mass index.