Table 2.
Descriptive characteristics at baseline by tertiles of screen time and physical activity in 423,659 UK Biobank participants, 2006-2016
| Characteristics | Screen time tertiles |
Discretionary physical activity tertiles |
||||
|---|---|---|---|---|---|---|
| Lowest n=125,679 |
Middle n=164,728 |
Highest n=133,252 |
Lowest n=141,584 |
Middle n=141,203 |
Highest n=140,872 |
|
| Median ((IQR), hrs/day) | 2.0 (1.5-2.0) | 3.5 (3.0-4.0) | 6.0 (5.0-7.0) | 0.1 (0.0-0.2) | 0.4 (0.3-0.5) | 1.3 (0.9-1.8) |
| Male sex, n (%) | 49,750 (39.6) | 75,051 (45.6) | 67,248 (50.5) | 56,869 (40.2) | 62,014 (43.9) | 73,166 (51.9) |
| Age (yrs) | 54.4 (8.0) | 56.4 (8.0) | 57.3 (8.0) | 55.7 (8.1) | 55.7 (8.1) | 56.9 (8.1) |
| Ethnicity, n (%) | ||||||
| White | 118,985 (94.7) | 157,067 (95.4) | 125,339 (94.1) | 129,560 (91.5) | 135,242 (95.8) | 136,589 (97.0) |
| Mixed | 701 (0.6) | 886 (0.5) | 842 (0.6) | 1,031 (0.7) | 724 (0.5) | 674 (0.5) |
| Asian | 2,869 (2.3) | 2,867 (1.7) | 2,319 (1.7) | 4,440 (3.1) | 2,185 (1.6) | 1,430 (1.0) |
| Black | 1,572 (1.3) | 2,156 (1.3) | 2,949 (2.2) | 3,857 (2.7) | 1,661 (1.2) | 1,159 (0.8) |
| Chinese | 399 (0.3) | 476 (0.3) | 480 (0.4) | 715 (0.5) | 365 (0.3) | 275 (0.2) |
| Other | 1,153 (0.9) | 1,276 (0.8) | 1,323 (1.0) | 1,981 (1.4) | 1,026 (0.7) | 745 (0.5) |
| Townsend index | -1.5 (3.0) | -1.5 (3.0) | -1.1 (3.2) | -0.8 (3.3) | -1.6 (2.9) | -1.8 (2.8) |
| Unemployed, n (%) | 33,844 (26.9) | 64,604 (39.2) | 69,862 (52.4) | 51,506 (36.4) | 50,179 (35.5) | 66,625 (47.3) |
| Alcohol status, n (%) | ||||||
| Never | 5,844 (4.7) | 6,511 (4.0) | 5,494 (4.1) | 8,652 (6.1) | 4,830 (3.4) | 4,367 (3.1) |
| Previous | 3,801 (3.0) | 4,943 (3.0) | 5,306 (4.0) | 6,048 (4.3) | 3,947 (2.8) | 4,055 (2.9) |
| Current (<3 times/week) | 57,817 (46.0) | 80,030 (48.6) | 67,029 (50.3) | 75,220 (53.1) | 67,615 (47.9) | 62,041 (44.0) |
| Current (≥3 times/week) | 58,217 (46.3) | 73,244 (44.5) | 55,423 (41.6) | 51,664 (36.5) | 64,811 (45.9) | 70,409 (50.0) |
| Smoking status, n (%) | ||||||
| Never | 77,555 (61.7) | 92,392 (56.1) | 67,238 (50.5) | 77,217 (54.5) | 81,342 (57.6) | 78,626 (55.8) |
| Previous | 37,575 (29.9) | 56,013 (34.0) | 49,541 (37.2) | 45,506 (32.1) | 47,480 (33.6) | 50,143 (35.6) |
| Current | 10,549 (8.4) | 16,323 (9.9) | 16,473 (12.4) | 18,861 (13.3) | 12,381 (8.8) | 12,103 (8.6) |
| Fruit and vegetable intake, n (%) | ||||||
| Low | 20,943 (16.7) | 32,290 (19.6) | 29,486 (22.1) | 36,683 (25.9) | 25,625 (18.2) | 20,411 (14.5) |
| Moderately low | 36,630 (29.2) | 49,549 (30.1) | 40,919 (30.7) | 45,389 (32.1) | 43,457 (30.8) | 38,252 (27.2) |
| Moderate | 35,532 (28.3) | 44,903 (27.3) | 35,185 (26.4) | 35,064 (24.8) | 39,684 (28.1) | 40,872 (29.0) |
| Moderately high | 23,115 (18.4) | 27,656 (16.8) | 20,294 (15.2) | 18,448 (13.0) | 23,746 (16.8) | 28,871 (20.5) |
| High | 9,459 (7.5) | 10,330 (6.3) | 7,368 (5.5) | 6,000 (4.2) | 8,691 (6.2) | 12,466 (8.9) |
| Processed and red meat intake (N days/week) | 0.8 (0.5) | 0.9 (0.5) | 1.0 (0.6) | 0.9 (0.6) | 0.9 (0.5) | 0.9 (0.6) |
| Salt adding, No (%) | ||||||
| Never/rarely | 75,118 (59.8) | 91,857 (55.8) | 69,012 (51.8) | 74,063 (52.3) | 80,437 (57.0) | 81,487 (57.8) |
| Sometimes | 33,823 (26.9) | 46,647 (28.3) | 38,481 (28.9) | 40,955 (28.9) | 39,659 (28.1) | 38,337 (27.2) |
| Usually | 12,453 (9.9) | 18,889 (11.5) | 17,599 (13.2) | 17,788 (12.6) | 15,680 (11.1) | 15,473 (11.0) |
| Always | 4,285 (3.4) | 7,335 (4.5) | 8,160 (6.1) | 8,778 (6.2) | 5,427 (3.8) | 5,575 (4.0) |
| Oily fish intake, n (%) | ||||||
| Never | 12,450 (9.9) | 17,481 (10.6) | 16,626 (12.5) | 19,923 (14.1) | 13,871 (9.8) | 12,763 (9.1) |
| <1 time/week | 41,268 (32.8) | 54,828 (33.3) | 46,528 (34.9) | 52,663 (37.2) | 48,011 (34.0) | 41,950 (29.8) |
| 1 time/week | 48,921 (38.9) | 63,050 (38.3) | 48,028 (36.0) | 49,073 (34.7) | 55,175 (39.1) | 55,751 (39.6) |
| > 1 time/week | 23,040 (18.3) | 29,369 (17.8) | 22,070 (16.6) | 19,925 (14.1) | 24,146 (17.1) | 30,408 (21.6) |
| Sleep duration, n (%) | ||||||
| <7 hrs/day | 28,332 (22.5) | 39,497 (24.0) | 35,415 (26.6) | 39,795 (28.1) | 32,364 (22.9) | 31,085 (22.1) |
| 7-8 hrs/day | 90,375 (71.9) | 114,072 (69.3) | 85,406 (64.1) | 90,278 (63.8) | 99,697 (70.6) | 99,878 (70.9) |
| >8 hrs/day | 6,972 (5.6) | 11,159 (6.8) | 12,431 (9.3) | 11,511 (8.1) | 9,142 (6.5) | 9,909 (7.0) |
| Antihypertensive drugs, n (%) | 16,398 (13.1) | 30,788 (18.7) | 31,606 (23.7) | 30,724 (21.7) | 24,208 (17.1) | 23,860 (16.9) |
| Lipid lowering drugs, n (%) | 11,825 (9.4) | 24,110 (14.6) | 26,250 (19.7) | 23,674 (16.7) | 18,894 (13.4) | 19,617 (13.9) |
| History of diabetes, n (%) | 3,574 (2.8) | 7,062 (4.3) | 9,007 (6.8) | 9,009 (6.4) | 5,519 (3.9) | 5,115 (3.6) |
| Parental CVD/diabetes history, n (%) | 92,595 (73.7) | 122,121 (74.1) | 98,746 (74.1) | 104,913 (74.1) | 105,153 (74.5) | 103,396 (73.4) |
| Parental cancer history, n (%) | 37,482 (29.8) | 50,487 (30.6) | 41,321 (31.0) | 42,265 (29.9) | 43,184 (30.6) | 43,841 (31.1) |
| Body mass index (kg/m2) | 26.0 (4.3) | 27.4 (4.6) | 28.5 (5.0) | 28.3 (5.3) | 27.1 (4.5) | 26.6 (4.1) |
Results are means (SD) unless indicated otherwise. Parental CVD/diabetes history includes a maternal or paternal history of heart disease, stroke, hypertension or diabetes. Parental cancer history includes history of bowel, lung, maternal breast or paternal prostate cancer.