Table 2.
Primary and secondary outcomes by experimental group (n=1204)
| Immunity | Antibody | ||||||
| All | Passport | Certificate | Test | Passport | Certificate | Test | |
| (n=1204) | (n=187) | (n=235) | (n=179) | (n=219) | (n=209) | (n=175) | |
| Perceived meaning of result for future risk, n (%) | |||||||
| No risk | 174 (14.5) | 26 (13.9) | 50 (21.3) | 39 (21.8) | 24 (11.0) | 19 (9.1) | 16 (9.1) |
| Lower risk (in line with description) | 697 (57.9) | 106 (56.7) | 127 (54.0) | 92 (51.4) | 126 (57.5) | 134 (64.1) | 112 (64.0) |
| Average risk | 248 (20.6) | 40 (21.4) | 42 (17.9) | 36 (20.1) | 54 (24.7) | 41 (19.6) | 35 (20.0) |
| Higher risk | 85 (7.1) | 15 (8.0) | 16 (6.8) | 12 (6.7) | 15 (6.8) | 15 (7.2) | 12 (6.9) |
| Perceived absolute risk (0–100) (mean (SD)) | 37.7 (25.2) | 40.4 (26.5) | 37.0 (25.4) | 34.2 (27.1) | 39.5 (23.6) | 36.9 (25.2) | 37.9 (23.1) |
| Perceived residual risk, n (%) | |||||||
| 1%–100% | 1144 (95.0) | 179 (95.7) | 219 (93.2) | 161 (89.9) | 214 (97.7) | 200 (95.7) | 171 (97.7) |
| 0% | 60 (5.0) | 8 (4.3) | 16 (6.8) | 18 (10.1) | 5 (2.3) | 9 (4.3) | 4 (2.3) |
| Intention to wash hands, n (%) | |||||||
| Much less than now | 13 (1.1) | 3 (1.6) | 7 (3.0) | 0 (0.0) | 0 (0.0) | 2 (1.0) | 1 (0.6) |
| Less than now | 46 (3.8) | 6 (3.2) | 11 (4.7) | 7 (3.9) | 8 (3.7) | 10 (4.8) | 4 (2.3) |
| Same as now | 800 (66.4) | 121 (64.7) | 159 (67.7) | 127 (70.9) | 138 (63.0) | 143 (68.4) | 112 (64.0) |
| More than now | 161 (13.4) | 23 (12.3) | 26 (11.1) | 18 (10.1) | 34 (15.5) | 29 (13.9) | 31 (17.7) |
| Much more than now | 184 (15.3) | 34 (18.2) | 32 (13.6) | 27 (15.1) | 39 (17.8) | 25 (12.0) | 27 (15.4) |
| Intention to avoid physical contact, n (%) | |||||||
| Much less than now | 36 (3.0) | 2 (1.1) | 9 (3.8) | 10 (5.6) | 4 (1.8) | 6 (2.9) | 5 (2.9) |
| Less than now | 201 (16.7) | 35 (18.7) | 48 (20.4) | 29 (16.2) | 32 (14.6) | 33 (15.8) | 24 (13.7) |
| Same as now | 642 (53.3) | 96 (51.3) | 116 (49.4) | 96 (53.6) | 116 (53.0) | 126 (60.3) | 92 (52.6) |
| More than now | 178 (14.8) | 28 (15.0) | 34 (14.5) | 21 (11.7) | 44 (20.1) | 27 (12.9) | 24 (13.7) |
| Much more than now | 147 (12.2) | 26 (13.9) | 28 (11.9) | 23 (12.8) | 23 (10.5) | 17 (8.1) | 30 (17.1) |
| Would you have the test if offered? n (%) | |||||||
| No, definitely not | 38 (3.2) | 5 (2.7) | 14 (6.0) | 5 (2.8) | 5 (2.3) | 4 (1.9) | 5 (2.9) |
| No, probably not | 140 (11.6) | 24 (12.8) | 28 (11.9) | 23 (12.8) | 23 (10.5) | 20 (9.6) | 22 (12.6) |
| Yes, probably | 351 (29.2) | 54 (28.9) | 67 (28.5) | 53 (29.6) | 62 (28.3) | 58 (27.8) | 57 (32.6) |
| Yes, definitely | 675 (56.1) | 104 (55.6) | 126 (53.6) | 98 (54.7) | 129 (58.9) | 127 (60.8) | 91 (52.0) |