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Table 1 Baseline characteristics of women and men in UK Biobank

From: Is occupational physical activity associated with mortality in UK Biobank?

  No paid employment In paid employment All
Women Men Women Men Women Men
n (%) 109,591 (58) 78,869 (42) 138,062 (52) 126,362 (48) 247,653 (55) 205,231 (45)
Working hours per week, median (IQR) 0 (0;0) 0 (0;0) 35 (22;40) 40 (37;45) 15 (0;36) 15 (0;36)
Age in years at baseline, mean (SD) 61 (6) 62 (6) 52 (7) 53 (7) 56 (8) 57 (8)
White ethnicity, % 96 96 95 95 95 95
Highest educational level
 No qualification, % 26 26 8 10 16 16
 Any other qualification, % 50 45 53 51 52 49
 Degree or above, % 24 29 38 39 32 35
Townsend index (higher for more deprived), median (IQR) −2.4 (−3.8;0.1) −2.3 (−3.7;0.5) − 2.1 (−3.6;0.4) −2.2 (−3.7;0.3) −2.2 (−3.7;0.3) −2.2 (−3.7;0.4)
Household income before tax*
 Prefer not to answer, % 14 9 8 6 10 7
 Do not know, % 9 3 3 1 5 2
  < £18,000, % 31 35 11 7 20 18
 £18,000–£30,999, % 24 27 21 19 22 22
 £31,000–£51,999, % 13 17 28 30 22 25
 £52,000–£100,000, % 6 7 24 30 16 21
  > £100,000, % 2 1 6 8 4 6
Occupational category
 Retired, % 80 82    35 32
 Caring for home/family, % 11 1    5 1
 Unable to work due to illness, % 5 9    2 4
 Unemployed, % 2 6    1 2
 Unpaid work, % 1 1    1 0
 Student, % 1 0    0 0
 No manual, no standing/walking, %    38 34 21 21
 No manual, Some standing/walking, %    23 22 13 14
 No manual, Mostly standing/walking, %    12 7 7 4
 Some manual, some standing/walking, %    6 9 4 5
 Some manual, mostly standing/walking, %    12 12 7 7
 Mostly manual, mostly standing/walking, %    9 16 5 10
Smoking status
 Never, % 58 42 61 54 60 50
 Previous, % 34 46 30 34 32 39
 Current, % 8 12 9 12 9 12
Alcohol use status
 Never, % 7 3 4 2 5 2
 Previous, % 4 4 3 3 3 3
 Current, % 89 93 93 95 91 94
Fruit/vegetable score, median (IQR) 2 (1;3) 1 (1;2) 2 (1;3) 1 (0;2) 2 (1;3) 1 (1;2)
Red/processed meat score, median (IQR) 1 (1;1) 1 (1;1) 1 (1;1) 1 (1;1) 1 (1;1) 1 (1;1)
Adds salt to food, % 38 41 38 41 38 41
Consumes oily fish, % 28 31 35 38 32 35
Non-occupational PAEE (kJ/day/kg), mean (SD) 43 (3) 42 (3) 44 (3) 43 (4) 44 (3) 42 (4)
Parental history of CVD or cancer, % 76 72 69 66 72 68
Blood pressure or cholesterol medication, % 33 47 14 23 23 33
Diagnosis of diabetes or insulin prescription, % 5 10 2 5 4 7
Prevalent CVD or cancer at baseline, % 18 24 9 10 13 15
Body mass index
  < 25 kg/m2, % 36 25 43 26 40 25
 25–30 kg/m2, % 39 49 35 50 37 50
  > 30 kg/m2, % 25 26 22 25 23 25
Resting heart rate in bpm, mean (SD) 71 (11) 69 (12) 70 (10) 68 (11) 70 (11) 68 (12)
  1. bpm beats per minute, CVD cardiovascular disease, IQR interquartile range, OPA occupational physical activity, PAEE physical activity energy expenditure, SD standard deviation
  2. *Values for other categorical variables using original UK Biobank coding are much smaller, so these are not reported in the table. Values for responses of “Do not know” / “Prefer not to answer” in other categorical variables: ethnic background (n = 1180 / 131), consumes oily fish (n = 1924 / 0), job involves shift work (n = 237 / 97), education (n = 0 / 4437), smoking status (n = 0 / 1433), alcohol use status (n = 0 / 364), adds salt to food (n = 0 / 229), blood pressure or cholesterol medication (n = 0 / 519), diagnosis of diabetes or insulin prescription (n = 0 / 265)