Table 1 Baseline characteristics by self-report daily TV viewing time. Values are numbers and percentages unless otherwise stated
| Â | Â | Total TV viewing time | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
Total | ≤1 h per day | 1- ≤ 3 h per day | 3- ≤ 5 h per day | > 5 h/day | ||||||
No./mean | %/SD | No./mean | %/SD | No./mean | %/SD | No./mean | %/SD | No./mean | %/SD | |
Total participants | 470,578 | 100.0% | 97,419 | 20.7% | 236,988 | 50.4% | 110,334 | 23.5% | 25,837 | 5.5% |
Self-report total screen time (hours/day; mean/SD) | 3.9 | 2.1 | 2.0 | 1.5 | 3.5 | 1.4 | 5.3 | 1.4 | 7.9 | 2.4 |
Time spent watching TV (hours/day; mean/SD) | 2.8 | 1.7 | 0.7 | 0.4 | 2.5 | 0.5 | 4.3 | 0.5 | 6.9 | 1.8 |
Time spent using computers (hours/day; mean/SD) | 1.1 | 1.4 | 1.2 | 1.5 | 1.1 | 1.3 | 1.0 | 1.3 | 1.1 | 1.7 |
IPAQ physical activity (mean/SD) | ||||||||||
 Hours/day of walking | 0.75 | 0.78 | 0.71 | 0.74 | 0.76 | 0.79 | 0.77 | 0.79 | 0.67 | 0.74 |
 Hours/day of moderate-intensity physical activity | 0.56 | 0.72 | 0.54 | 0.70 | 0.57 | 0.73 | 0.58 | 0.74 | 0.46 | 0.67 |
 Hours/day of vigorous-intensity physical activity | 0.20 | 0.35 | 0.22 | 0.34 | 0.20 | 0.35 | 0.18 | 0.35 | 0.14 | 0.33 |
Age at baseline (mean/SD) | 56.3 | 8.1 | 54.2 | 8.0 | 55.9 | 8.1 | 58.5 | 7.6 | 59.0 | 7.6 |
Height (m) (mean/SD) | 1.7 | 0.1 | 1.7 | 0.1 | 1.7 | 0.1 | 1.7 | 0.1 | 1.7 | 0.1 |
Sex | ||||||||||
 Female | 253,188 | 53.8% | 53,500 | 54.9% | 127,135 | 53.7% | 59,553 | 54.0% | 13,000 | 50.3% |
 Male | 217,390 | 46.2% | 43,919 | 45.1% | 109,853 | 46.4% | 50,781 | 46.0% | 12,837 | 49.7% |
Ethnicity | ||||||||||
 White | 443,484 | 94.6% | 90,405 | 93.3% | 224,142 | 94.9% | 104,922 | 95.4% | 24,015 | 93.3% |
 Black | 7505 | 1.6% | 1549 | 1.6% | 3358 | 1.4% | 1846 | 1.7% | 752 | 2.9% |
 South Asian | 9395 | 2.0% | 2582 | 2.7% | 4721 | 2.0% | 1639 | 1.5% | 453 | 1.8% |
 Chinese | 1501 | 0.3% | 465 | 0.5% | 717 | 0.3% | 266 | 0.2% | 53 | 0.2% |
 Mixed background or others | 7069 | 1.5% | 1949 | 2.0% | 3299 | 1.4% | 1354 | 1.2% | 467 | 1.8% |
Townsend deprivation quintile | ||||||||||
 1 (Least deprived) | 94,590 | 20.1% | 19,860 | 20.4% | 51,164 | 21.6% | 20,497 | 18.6% | 3069 | 11.9% |
 2 | 93,950 | 20.0% | 18,854 | 19.4% | 49,804 | 21.0% | 21,691 | 19.7% | 3601 | 14.0% |
 3 | 94,166 | 20.0% | 18,857 | 19.4% | 48,706 | 20.6% | 22,379 | 20.3% | 4224 | 16.4% |
 4 | 94,118 | 20.0% | 20,209 | 20.8% | 46,505 | 19.7% | 22,081 | 20.0% | 5323 | 20.6% |
 5 (Most deprived) | 93,165 | 19.8% | 19,530 | 20.1% | 40,495 | 17.1% | 23,561 | 21.4% | 9579 | 37.1% |
Education | ||||||||||
 University degree | 153,223 | 33.1% | 52,250 | 54.3% | 79,041 | 33.9% | 19,257 | 17.8% | 2675 | 10.6% |
 A-levels/HNC/HND/NVQ | 83,315 | 18.0% | 15,934 | 16.6% | 44,649 | 19.1% | 18,921 | 17.5% | 3811 | 15.1% |
 GCSE/O-level/CSE | 124,765 | 26.9% | 17,518 | 18.2% | 66,180 | 28.3% | 34,257 | 31.6% | 6810 | 27.0% |
 Other | 24,018 | 5.2% | 4230 | 4.4% | 12,530 | 5.4% | 6091 | 5.6% | 1167 | 4.6% |
 None | 78,028 | 16.8% | 6346 | 6.6% | 31,125 | 13.3% | 29,800 | 27.5% | 10,757 | 42.7% |
Smoking statusa | ||||||||||
 Never | 257,696 | 55.0% | 58,981 | 60.7% | 132,976 | 56.3% | 54,858 | 49.9% | 10,881 | 42.4% |
 Former light smoker | 119,085 | 25.4% | 24,556 | 25.3% | 61,147 | 25.9% | 27,891 | 25.4% | 5491 | 21.4% |
 Former heavy smoker | 42,251 | 9.0% | 5350 | 5.5% | 19,256 | 8.2% | 13,521 | 12.3% | 4124 | 16.1% |
 Current light smoker | 27,794 | 5.9% | 5535 | 5.7% | 13,706 | 5.8% | 6646 | 6.1% | 1907 | 7.4% |
 Current heavy smoker | 22,082 | 4.7% | 2735 | 2.8% | 9094 | 3.9% | 6972 | 6.3% | 3281 | 12.8% |
Alcohol intake | ||||||||||
 Never | 20,749 | 4.4% | 4873 | 5.0% | 9428 | 4.0% | 4868 | 4.4% | 1580 | 6.1% |
 Former drinker | 16,659 | 3.5% | 3330 | 3.4% | 7128 | 3.0% | 4342 | 3.9% | 1859 | 7.2% |
 Current drinker: <once/week | 106,020 | 22.6% | 19,466 | 20.0% | 50,958 | 21.5% | 27,939 | 25.3% | 7657 | 29.7% |
 Current drinker: ≥once/week | 326,759 | 69.5% | 69,676 | 71.6% | 169,324 | 71.5% | 73,089 | 66.3% | 14,670 | 56.9% |
Dietary intake (mean/SD) | ||||||||||
 Fruits and vegetables (portion/day) | 4.7 | 3.1 | 5.1 | 3.2 | 4.7 | 3.0 | 4.5 | 3.0 | 4.2 | 3.3 |
 Red meat (portion/week) | 2.1 | 1.5 | 2.0 | 1.4 | 2.1 | 1.4 | 2.2 | 1.5 | 2.4 | 1.7 |
 Processed meat (portion/week) | 1.5 | 1.4 | 1.3 | 1.4 | 1.5 | 1.4 | 1.6 | 1.4 | 1.9 | 1.6 |
Body Mass Index (Kg/m2) (mean/SD) | 27.4 | 4.8 | 26.0 | 4.3 | 27.3 | 4.6 | 28.5 | 4.9 | 29.7 | 5.8 |
Body Mass Index (Kg/m2) | ||||||||||
  < 18.5 | 2418 | 0.5% | 825 | 0.9% | 1113 | 0.5% | 352 | 0.3% | 128 | 0.5% |
 18.5- < 25 | 152,533 | 32.6% | 44,075 | 45.5% | 77,507 | 32.9% | 26,157 | 23.8% | 4794 | 18.8% |
 25- < 30 | 199,212 | 42.6% | 37,528 | 38.7% | 103,141 | 43.7% | 48,586 | 44.3% | 9957 | 39.1% |
 30+ | 113,922 | 24.3% | 14,489 | 15.0% | 54,197 | 23.0% | 34,626 | 31.6% | 10,610 | 41.6% |
Body fat percentage (mean/SD) | 31.3 | 8.5 | 28.9 | 8.3 | 31.1 | 8.4 | 33.2 | 8.4 | 34.3 | 8.8 |
Waist:hip ratiob | ||||||||||
 Waist:hip ratio (mean/SD) | 0.9 | 0.1 | 0.9 | 0.1 | 0.9 | 0.1 | 0.9 | 0.1 | 0.9 | 0.1 |
 Below IDF guideline | 202,545 | 43.2% | 54,750 | 56.4% | 104,482 | 44.2% | 36,717 | 33.4% | 6596 | 25.7% |
 Above IDF guideline | 266,443 | 56.8% | 42,333 | 43.6% | 131,829 | 55.8% | 73,249 | 66.6% | 19,032 | 74.3% |
Health status | ||||||||||
 Diabetesc | 24,347 | 5.2% | 3085 | 3.2% | 10,404 | 4.4% | 7687 | 7.0% | 3171 | 12.4% |
 Gastro-oesophageal refluxd | 22,495 | 4.8% | 3233 | 3.3% | 10,672 | 4.5% | 6648 | 6.0% | 1942 | 7.5% |
Family historye | ||||||||||
 Prostate cancer | 37,225 | 8.0% | 8431 | 8.8% | 18,607 | 8.0% | 8332 | 7.7% | 1855 | 7.3% |
 Breast cancer | 49,524 | 10.7% | 10,520 | 10.9% | 24,986 | 10.7% | 11,360 | 10.5% | 2658 | 10.5% |
 Lung cancer | 59,042 | 12.7% | 9596 | 10.0% | 29,218 | 12.5% | 16,107 | 14.9% | 4121 | 16.3% |
 Bowel cancer | 52,109 | 11.2% | 10,181 | 10.6% | 25,851 | 11.1% | 12,943 | 11.9% | 3134 | 12.4% |
Use of sun/UV protection | ||||||||||
 Never/rarely/sometimes | 203,968 | 43.7% | 43,450 | 44.9% | 99,121 | 42.1% | 48,286 | 44.1% | 13,111 | 51.4% |
 Most of the time/always | 260,241 | 55.7% | 52,699 | 54.5% | 135,033 | 57.4% | 60,493 | 55.3% | 12,016 | 47.1% |
 Do not go out in sunshine | 2770 | 0.6% | 538 | 0.6% | 1136 | 0.5% | 717 | 0.7% | 379 | 1.5% |
Aspirin use | ||||||||||
 Regularly uses aspirinf | 64,822 | 14.0% | 9711 | 10.1% | 29,908 | 12.9% | 19,246 | 17.8% | 5957 | 23.7% |
HRT useg | ||||||||||
 Ever used HRT | 95,369 | 37.8% | 14,791 | 27.8% | 46,587 | 36.8% | 27,639 | 46.6% | 6352 | 49.1% |
Oral contraceptive useg | ||||||||||
 Ever taken oral contraceptive pill | 205,528 | 81.4% | 44,285 | 83.0% | 104,772 | 82.7% | 46,695 | 78.7% | 9776 | 75.6% |
Number of live births (0, 1, 2, 3+ live births)g(mean/SD) | 1.8 | 1.2 | 1.8 | 1.2 | 1.8 | 1.2 | 1.9 | 1.2 | 2.0 | 1.3 |
Age at menarche (mean/SD)g | 13.0 | 1.6 | 13.0 | 1.6 | 13.0 | 1.6 | 13.0 | 1.7 | 13.0 | 1.7 |
Age at menopause (mean/SD)g | 49.8 | 5.1 | 50.0 | 4.7 | 49.9 | 5.0 | 49.6 | 5.4 | 49.0 | 5.8 |
Menopausal statusg | ||||||||||
 Had menopause | 151,101 | 59.8% | 27,736 | 51.9% | 74,075 | 58.4% | 40,399 | 68.0% | 8891 | 68.6% |
 Not had menopause | 62,570 | 24.8% | 18,659 | 34.9% | 33,174 | 26.1% | 9075 | 15.3% | 1662 | 12.8% |
 Unsure | 39,065 | 15.5% | 7002 | 13.1% | 19,684 | 15.5% | 9969 | 16.8% | 2410 | 18.6% |
Hysterectomy statusg | ||||||||||
 Had hysterectomy | 17,530 | 7.8% | 2458 | 5.0% | 8193 | 7.2% | 5483 | 10.6% | 1396 | 12.7% |
 Not had hysterectomy/unsure | 207,953 | 92.2% | 46,846 | 95.0% | 105,238 | 92.8% | 46,232 | 89.4% | 9637 | 87.4% |