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Table 1 Baseline characteristics of the study population in UK Biobank, by body mass index categories

From: Body mass index and cancer risk among adults with and without cardiometabolic diseases: evidence from the EPIC and UK Biobank prospective cohort studies

 

Under- and normal weight a

N = 119,149 (35%)

Overweight a

N = 148,064 (43%)

Obesity a

N = 76,881 (22%)

Overall

N = 344,094

Sex, n(%)

 Female

76,055 (64)

66,409 (45)

38,764 (50)

181,228 (53)

Age at assessment (years)

 Median (IQR)

56.0 [48.0, 62.0]

57.0 [50.0, 63.0]

57.0 [50.0, 62.0]

57.0 [49.0, 62.0]

Follow-up (years)

 Median (IQR)

10.9 [10.1, 11.6]

10.9 [10.1, 11.7]

10.9 [10.1, 11.7]

10.9 [10.1, 11.7]

Height (cm)

 Median (IQR)

167 [162, 174]

170 [163, 177]

168 [161, 176]

169 [162, 176]

Qualifications, n (%)

 College or University degree

51,407 (43)

51,671 (35)

21,845 (28)

124,923 (36)

 A levels/AS levels or equivalent

15,010 (13)

17,284 (12)

8,821 (11)

41,115 (12)

 O levels/GCSEs or equivalent

23,953 (20)

32,021 (22)

17,602 (23)

73,576 (21)

 CSEs or equivalent

5,493 (4.6)

7,874 (5.3)

4,998 (6.5)

18,365 (5.3)

 NVQ or HND or HNC or equivalent

5,671 (4.8)

10,458 (7.1)

6,048 (7.9)

22,177 (6.4)

 Other professional qualifications nursing, teaching

5,400 (4.5)

7,516 (5.1)

4,235 (5.5)

17,151 (5.0)

 None of the above

12,215 (10)

21,240 (14)

13,332 (17)

46,787 (14)

Smoking status, n (%)

 Never

71,703 (60)

80,889 (55)

40,364 (52)

192,956 (56)

 Previous

34,782 (29)

52,417 (35)

29,193 (38)

116,392 (34)

 Current

12,664 (11)

14,758 (10)

7,324 (9.5)

34,746 (10)

Alcohol consumption frequency, n (%)

 Never

7,904 (6.6)

9,380 (6.3)

6,664 (8.7)

23,948 (7.0)

 Special occasions only

11,080 (9.3)

13,650 (9.2)

10,889 (14)

35,619 (10)

 One to three times a month

12,088 (10)

15,342 (10)

10,340 (13)

37,770 (11)

 Once or twice a week

30,071 (25)

38,686 (26)

20,422 (27)

89,179 (26)

 Three or four times a week

30,235 (25)

37,753 (25)

15,770 (20)

83,758 (24)

 Daily or almost daily

27,771 (23)

33,253 (22)

12,796 (17)

73,820 (21)

Diet score, n (%)b

 6, healthier

4,452 (3.7)

3,511 (2.4)

1,447 (1.9)

9,410 (2.7)

 5

27,652 (23)

27,909 (19)

12,587 (16)

68,148 (20)

 4

51,532 (43)

62,650 (42)

30,876 (40)

145,058 (42)

 3

26,883 (23)

40,009 (27)

22,763 (30)

89,655 (26)

 2

7,108 (6.0)

11,476 (7.8)

7,377 (9.6)

25,961 (7.5)

 1

1,339 (1.1)

2,224 (1.5)

1,624 (2.1)

5,187 (1.5)

 0, unhealthier

183 (0.2)

285 (0.2)

207 (0.3)

675 (0.2)

Physical activity, n (%)

High

53,248 (45)

61,193 (41)

26,220 (34)

140,661 (41)

 Moderate

48,724 (41)

60,683 (41)

30,974 (40)

140,381 (41)

 Low

17,177 (14)

26,188 (18)

19,687 (26)

63,052 (18)

Menopause status, n (%)c

 Premenopause

23,736 (31)

15,691 (24)

9,344 (24)

48,771 (27)

 Postmenopause

43,180 (57)

40,668 (61)

22,283 (57)

106,131 (59)

 Not sure

9,139 (12)

10,050 (15)

7,137 (18)

26,326 (14)

Ever use HRT, n (%)c

 No

51,133 (67)

40,401 (61)

24,462 (63)

115,996 (64)

 Yes

24,922 (33)

26,008 (39)

14,302 (37)

65,232 (36)

  1. Notes: more information on covariates, is given in Supplementary Table S2
  2. Abbreviations: UKB UK Biobank, IQR Interquartile range, HRT hormone replacement therapy
  3. aFollowing WHO categorisation of body mass index (BMI), Underweight [BMI < 18.5 kg/m2], Normal weight [BMI ≥ 18.5 and < 25 kg/m2], Overweight [BMI ≥ 25 and < 30 kg/m2], Obesity [BMI ≥ 30 kg/m2]
  4. bScores are arranged from the healthier (6)—Healthy diet score was calculated based on consumption of commonly eaten food groups following recommendations (see Supplementary Table S2)
  5. cOnly for women
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BMC Medicine

ISSN: 1741-7015

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