Table 5.
Final survey behavioural responses, by group
| Self-isolation group (n=8807) | DCT positive-test subgroup (n=754) | DCT no-positive-test subgroup (n=10 443) | p value* | |
|---|---|---|---|---|
| (1) Last 24 h activities† | ||||
| Work, college, university | 72 (25%) | 24 (20%) | 2462 (29%) | 0·028 |
| Other indoor place | 105 (37%) | 42 (35%) | 3813 (45%) | 0·0013 |
| Outdoors with friends or family | 72 (25%) | 21 (17%) | 2349 (28%) | 0·023 |
| Indoors with friends or family | 54 (19%) | 9 (7%) | 1146 (14%) | 0·0050 |
| Any other reason | 110 (39%) | 67 (55%) | 2984 (35%) | <0·0001 |
| None of these† | 487 (63%) | 631 (84%) | 2029 (20%) | <0·0001 |
| (2) 7 days close contacts during study period | ||||
| Much more | 209 (2%) | 9 (1%) | 374 (4%) | <0·0001 |
| Slightly more | 289 (3%) | 20 (3%) | 742 (7%) | .. |
| About the same | 699 (8%) | 67 (9%) | 1801 (17%) | .. |
| Slightly less | 415 (5%) | 28 (4%) | 1563 (15%) | .. |
| Much less | 7180 (82%) | 626 (84%) | 5946 (57%) | .. |
| (3) Confidence in test accuracy | ||||
| Completely | 3590 (43%) | 255 (40%) | 4638 (44%) | <0·0001 |
| Very | 2997 (36%) | 156 (24%) | 4025 (39%) | .. |
| Fairly | 1510 (18%) | 121 (19%) | 1617 (16%) | .. |
| Not very | 180 (2%) | 68 (11%) | 127 (1%) | .. |
| Not at all | 69 (1%) | 44 (7%) | 33 (0%) | .. |
| (4) Activities while self-isolating | ||||
| Work, college, university | 713 (19%) | 29 (13%) | .. | 0·055 |
| Other indoor place | 1264 (33%) | 107 (48%) | .. | <0·0001 |
| Outdoors with friends or family | 918 (24%) | 49 (22%) | .. | 0·64 |
| Indoors with friends or family | 684 (18%) | 29 (13%) | .. | 0·096 |
| Left home for any other reason | 3122 (81%) | 168 (76%) | .. | 0·088 |
| (5) Reasons for leaving home when isolating‡ | ||||
| Earn money | 74 (2%) | 4 (2%) | .. | 0·99 |
| Keep my job | 59 (1%) | 4 (2%) | .. | 0·61 |
| Practical reasons (shopping, caring, etc) | 393 (8%) | 13 (6%) | .. | 0·33 |
| Mental health | 668 (14%) | 15 (7%) | .. | 0·0054 |
| Other important things | 265 (6%) | 18 (9%) | .. | 0·100 |
| Probably not infectious | 152 (3%) | 8 (4%) | .. | 0·79 |
| Didn't leave home‡ | 4099 (47%) | 532 (73%) | .. | <0·0001 |
| Take a coronavirus test | 4084 (87%) | 182 (87%) | .. | 1·000 |
Data completeness for the self-isolation group, the DCT positive-test subgroup, and—for questions (1) to (3)—the DCT no-positive-test subgroup, respectively, is given for each question, as follows: (1) “Thinking about yesterday, please tick all the things you did”. Data completeness: 769/8807 (8·7%), 752/754 (99·7%), and 10 431/10 443 (99·9%) provided at least one response for items 1–6. (2) “Compared to the week before, in the last 7 days did you have more or less close contact with people you don't live with, indoors and for more than 15 minutes?” Data completeness: 8792 (99·8%), 750 (99·5%), and 10 426 (99·8%) responded to this question. (3) [If yes to: “In the past 7 days, did you take any tests for coronavirus?”] “How confident are you that your test results were accurate?” Data completeness: 8346 (94·8%), 644 (85·4%), and 10 440 (100·0%) responded to this question. (4) “Thinking about the last 7 days, how often have you done each of these things [since getting your first positive test result]?”. (Note: these were recoded as binary never vs once or more; options were: never, once or twice, three or four times, five times or more.) Data completeness: 3858 (43·8%) and 221 (29·3%) provided at least one response to items 1–5. (5) “Did you leave home [following a positive test result or during your self-isolation period] for any of the following reasons? (Please tick all that apply)”. Data completeness: 8678 (98·5%) and 733 (97·2%) provided at least one response to items 1–8. Except where noted, percentages are calculated from those who responded to each question. DCT=daily contact testing.
For items where respondents were asked to tick all responses that applied to them, p values were calculated for each 2 × 2 comparison. For items where respondents were asked to select a single response, an overall p value was calculated for that item.
Percentages for responses 1–5 are calculated from those who reported leaving home; for response 6 (none of these), the proportion is calculated among those who responded to any of items 1–6.
Percentages for responses 1–6 are calculated from those who reported at least one reason for leaving home, which includes people who left home to take a coronavirus test (data not presented here); for response 7 (I didn't leave home) the proportion is calculated among those who provided at least one reponse to this question.