Behavioural Science and Insights Unit, UK Health Security Agency, Salisbury, UK
Behavioural Science and Insights Unit, UK Health Security Agency, Salisbury, UK.
BMJ Open. 2022 Mar 16;12(3):e056533. doi: 10.1136/bmjopen-2021-056533.
Individuals who receive a negative lateral flow coronavirus test result may misunderstand it as meaning 'no risk of infectiousness', giving false reassurance. This experiment tested the impact of adding information to negative test result messages about residual risk and the need to continue protective behaviours.
4 (residual risk) × 2 (post-test result behaviours) between-subjects design.
Online.
1200 adults from a representative UK sample recruited via Prolific (12-15 March 2021).
Participants were randomly allocated to one of eight messages. Residual risk messages were: (1) 'Your coronavirus test result is negative' (control); (2) message 1 plus 'It's likely you were not infectious when the test was done' (current NHS Test & Trace (T&T); (3) message 2 plus 'But there is still a chance you may be infectious' (elaborated NHS T&T); and (4) message 3 plus infographic depicting residual risk (elaborated NHS T&T+infographic). Each message contained either no additional information or information about the need to continue following guidelines and protective behaviours.
(1) Proportion understanding residual risk of infectiousness and (2) likelihood of engaging in protective behaviours (scales 1-7).
The control message decreased understanding relative to the current NHS T&T message: 54% versus 71% (Adjusted Odds Ratio (AOR)=0.56 95% CI 0.34 to 0.95, p=0.030). Understanding increased with the elaborated NHS T&T (89%; AOR=3.25 95% CI 1.64 to 6.42, p=0.001) and elaborated NHS T&T+infographic (91%; AOR=5.16 95% CI 2.47 to 10.82, p<0.001) compared with current NHS T&T message. Likelihood of engaging in protective behaviours was unaffected by information (AOR=1.11 95% CI 0.69 to 1.80, χ(1)=0.18, p=0.669), being high (6.4, =0.9) across the sample.
A considerable proportion of participants misunderstood the residual risk following a negative test result. The addition of a single sentence ('But there is still a chance you may be infectious') to current NHS T&T wording increased understanding of residual risk.
OSF: https://osf.io/byfz3/.
收到冠状病毒检测结果为阴性的人可能会误解其为“没有传染性”，从而产生错误的安全感。本实验测试了在阴性检测结果信息中添加关于残余风险和继续采取保护行为的必要性的信息对结果的影响。
4（残余风险）×2（测试后结果行为）被试间设计。
线上。
通过 Prolific（2021 年 3 月 12 日至 15 日）招募的来自代表性英国样本的 1200 名成年人。
参与者被随机分配到八个信息中的一个。残余风险信息为：（1）“您的冠状病毒检测结果为阴性”（对照组）；（2）信息 1 加“检测时您可能没有传染性”（当前的英国国民保健制度检测与追踪（T&T）；（3）信息 2 加“但仍有感染的可能”（详细的英国国民保健制度 T&T）；（4）信息 3 加说明残余风险的信息图（详细的英国国民保健制度 T&T+信息图）。每条信息都包含没有附加信息或需要继续遵循指导方针和保护行为的信息。
（1）对传染性残余风险的理解程度和（2）参与保护行为的可能性（1-7 分）。
与当前的 NHS T&T 信息相比，对照组信息降低了对残余风险的理解：54%对 71%（调整后的优势比（AOR）=0.56，95%置信区间（CI）0.34 至 0.95，p=0.030）。理解随着详细的 NHS T&T（89%；AOR=3.25，95%CI 1.64 至 6.42，p=0.001）和详细的 NHS T&T+信息图（91%；AOR=5.16，95%CI 2.47 至 10.82，p<0.001）而增加。与当前的 NHS T&T 信息相比，参与保护行为的可能性不受信息影响（AOR=1.11，95%CI 0.69 至 1.80，χ（1）=0.18，p=0.669），在整个样本中，保护行为的可能性都很高（6.4，=0.9）。
相当一部分参与者对阴性检测结果后的残余风险存在误解。在当前 NHS T&T 措辞中添加一句（“但仍有感染的可能”）增加了对残余风险的理解。
