Table 1.
Baseline characteristics of participants in three categories of TV viewing and computer use
| Characteristics | All | TV viewing | Computer use | ||||
|---|---|---|---|---|---|---|---|
| ≤ 1 h/day (n = 95591) | 2–3 h/day (n = 233532) | ≥ 4 h/day (n = 133401) | ≤ 1 h/day (n = 357726) | 2–3 h/day (n = 78171) | ≥ 4 h/day (n = 26627) | ||
| Age (Median, IQR) | 58 (50,63) | 54 (48,61) | 57 (50,63) | 61 (54,65) | 58 (50,63) | 58 (50,63) | 55 (48,61) |
| TDI (Median, IQR) | -2.2 (-3.7,0.4) | -2.1(-3.7,0.5) | -2.4 (-3.8,0) | -1.9 (-3.5,1.1) | -2.2(-3.7,0.3) | -2.1 (-3.6,0.7) | -1.7(-3.5,1.3) |
| BMI (Median, IQR) | 26.7(24.1,29.1 | 25.3(23,28.1) | 26.6(24.1,29.6) | 27.9(25.2,31.3) | 26.5(24,29.6) | 27.4(24.7,30.6) | 27.6(24.8,31) |
| Sex (n, %) | |||||||
| Female | 250879 (54.2) | 52813 (55.2) | 126113 (54) | 71953 (53.9) | 207076(57.9) | 33175 (42.4) | 10628 (39.9) |
| Male | 211645 (45.8) | 42778 (44.8) | 107419 (46) | 61448 (46.1) | 150650(42.1) | 44996 (57.6) | 15999 (60.1) |
| Ethnicity (n, %) | |||||||
| White people | 422157 (91.3) | 83775 (87.6) | 213922 (91.6) | 124460 (93.3) | 329378(92.1) | 69734 (89.2) | 23045 (86.5) |
| Mixed people | 16671 (3.6) | 3992 (4.2) | 8402 (3.6) | 4277 (3.2) | 12436 (3.5) | 2977 (3.8) | 1258 (4.7) |
| Other people | 23696 (5.1) | 7824 (8.2) | 11208 (4.8) | 4664 (3.5) | 15912 (4.4) | 5460 (7) | 2324 (8.7) |
| Education (n, %) | |||||||
| College/University | 153203 (33.1) | 52086 (54.5) | 79174 (33.9) | 21943 (16.4) | 108676(30.4) | 32374 (41.4) | 12153 (45.6) |
| Other | 309321(66.9) | 43505 (45.5) | 154358 (66.1) | 111458 (83.6) | 249050(69.6) | 45797 (58.6) | 14474 (54.4) |
| Smoking (n, %) | |||||||
| Never | 253414 (54.8) | 57805 (60.5) | 131176 (56.2) | 64433 (48.3) | 199695(55.8) | 40,201 (51.4) | 13518 (50.8) |
| Previous | 161005 (34.8) | 29797 (31.2) | 80251 (34.4) | 50957 (38.2) | 121456 (34) | 29979 (38.4) | 9570 (35.9) |
| Current | 48105 (10.4) | 7989 (8.4) | 22105 (9.5) | 18011 (13.5) | 36575 (10.2) | 7991 (10.2) | 3539 (13.3) |
| Alcohol (n, %) | |||||||
| Never | 19089 (4.1) | 4430 (4.6) | 8719 (3.7) | 5940 (4.5) | 14975 (4.2) | 2924 (3.7) | 1190 (4.5) |
| Previous | 16095 (3.5) | 3199 (3.3) | 6930 (3) | 5966 (4.5) | 11999 (3.4) | 2963 (3.8) | 1133 (4.3) |
| Current | 427340 (92.4) | 87962 (92) | 217883 (93.3) | 121,495 (91.1) | 330752(92.5) | 72284 (92.5) | 24304 (91.3) |
| MI (n, %) | |||||||
| No | 437877 (94.7) | 92393 (96.7) | 222405 (95.2) | 123,079 (92.3) | 339420(94.9) | 73,433 (93.9) | 25024 (94) |
| Yes | 24647 (5.3) | 3198 (3.3) | 11127 (4.8) | 10,322 (7.7) | 18306 (5.1) | 4738 (6.1) | 1603 (6) |
| Stroke (n, %) | |||||||
| No | 446621 (96.6) | 93395 (97.7) | 226408 (96.9) | 126818 (95.1) | 345697(96.6) | 75267 (96.3) | 25657 (96.4) |
| Yes | 15903 (3.4) | 2196 (2.3) | 7124 (3.1) | 6583 (4.9) | 12029 (3.4) | 2904 (3.7) | 970 (3.6) |
| Diabetes (n, %) | |||||||
| No | 423209 (91.5) | 90858 (95) | 216268 (92.6) | 116083 (87) | 329507(92.1) | 70052 (89.6) | 23650 (88.8) |
| Yes | 39315 (8.5) | 4733 (5) | 17264 (7.4) | 17318 (13) | 28219 (7.9) | 8119 (10.4) | 2977 (11.2) |
| Hypertension (n, %) | |||||||
| No | 285914 (61.8) | 68971 (72.2) | 148194 (63.5) | 68749 (51.5) | 223768(62.6) | 46037 (58.9) | 16109 (60.5) |
| Yes | 176610 (38.2) | 26620 (27.8) | 85338 (36.5) | 64652 (48.5) | 133958(37.4) | 32134 (41.1) | 10518 (39.5) |
| All cause dementia (yes, n, %) | 6650 (1.4) | 831 (0.9) | 2878 (1.2) | 2941 (2.2) | 5229 (1.5) | 1108 (1.4) | 313 (1.2) |
| AD (yes, n, %) | 2776 (0.6) | 347 (0.4) | 1243 (0.5) | 1186 (0.9) | 2237 (0.6) | 424 (0.5) | 115 (0.4) |
| VD (yes, n, %) | 1514 (0.3) | 165 (0.2) | 640 (0.3) | 709 (0.5) | 1179 (0.3) | 251 (0.3) | 84 (0.3) |