Table 2

Primary and secondary outcomes by experimental group (n=1204)

ImmunityAntibody
AllPassportCertificateTestPassportCertificateTest
(n=1204)(n=187)(n=235)(n=179)(n=219)(n=209)(n=175)
Perceived meaning of result for future risk, n (%)
 No risk174 (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 risk248 (20.6)40 (21.4)42 (17.9)36 (20.1)54 (24.7)41 (19.6)35 (20.0)
 Higher risk85 (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 now13 (1.1)3 (1.6)7 (3.0)0 (0.0)0 (0.0)2 (1.0)1 (0.6)
 Less than now46 (3.8)6 (3.2)11 (4.7)7 (3.9)8 (3.7)10 (4.8)4 (2.3)
 Same as now800 (66.4)121 (64.7)159 (67.7)127 (70.9)138 (63.0)143 (68.4)112 (64.0)
 More than now161 (13.4)23 (12.3)26 (11.1)18 (10.1)34 (15.5)29 (13.9)31 (17.7)
 Much more than now184 (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 now36 (3.0)2 (1.1)9 (3.8)10 (5.6)4 (1.8)6 (2.9)5 (2.9)
 Less than now201 (16.7)35 (18.7)48 (20.4)29 (16.2)32 (14.6)33 (15.8)24 (13.7)
 Same as now642 (53.3)96 (51.3)116 (49.4)96 (53.6)116 (53.0)126 (60.3)92 (52.6)
 More than now178 (14.8)28 (15.0)34 (14.5)21 (11.7)44 (20.1)27 (12.9)24 (13.7)
 Much more than now147 (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 not38 (3.2)5 (2.7)14 (6.0)5 (2.8)5 (2.3)4 (1.9)5 (2.9)
 No, probably not140 (11.6)24 (12.8)28 (11.9)23 (12.8)23 (10.5)20 (9.6)22 (12.6)
 Yes, probably351 (29.2)54 (28.9)67 (28.5)53 (29.6)62 (28.3)58 (27.8)57 (32.6)
 Yes, definitely675 (56.1)104 (55.6)126 (53.6)98 (54.7)129 (58.9)127 (60.8)91 (52.0)