Table 2.

Primary and secondary outcomes (% (n); mean (SD)) by experimental group

	Residual risk				Post-test result behaviours
	Control (n=300)	NHS T&T (n=298)	Elaborated (n=302)	Infographic (n=300)	None (n=602)	Included (n=598)
Primary measures
Understanding
I am not infectious	45.3 (n=136)	28.2 (n=84)	9.6 (n=29)	7.7 (n=23)	19.6 (n=118)	25.8 (n=154)
I am most likely not infectious*	54.3 (n=163)	71.1 (n=212)	88.7 (n=268)	90.7 (n=272)	79.7 (n=480)	72.7 (n=435)
I am most likely infectious	0 (n=0)	0.3 (n=1)	1.3 (n=4)	0.7 (n=2)	0.5 (n=3)	0.7 (n=4)
I am infectious	0.3 (n=1)	0.3 (n=1)	0.3 (n=1)	1.0 (n=3)	0.2%(n=1)	0.8 (n=5)
Specific behaviours
Average	6.40 (0.9)	6.46 (0.8)	6.42 (0.9)	6.33 (1.1)	6.39 (0.9)	6.41 (0.9)
Social distancing	6.52 (1.0)	6.55 (1.0)	6.53 (1.0)	6.46 (1.2)	6.53 (1.0)	6.50 (1.1)
Hand washing	6.45 (1.0)	6.50 (1.0)	6.46 (1.1)	6.41 (1.2)	6.48 (1.1)	6.44 (1.1)
Face covering	6.70 (0.8)	6.71 (0.9)	6.71 (0.9)	6.55 (1.3)	6.70 (0.9)	6.63 (1.1)
Avoid meeting others	6.20 (1.3)	6.21 (1.3)	6.15 (1.3)	6.00 (1.5)	6.09 (1.3)	6.18 (1.3)
Work from home	6.19 (1.5)	6.32 (1.4)	6.24 (1.4)	6.21 (1.4)	6.20 (1.5)	6.28 (1.4)
Avoid public transport	6.28 (1.4)	6.47 (1.2)	6.44 (1.2)	6.34 (1.3)	6.35 (1.3)	6.43 (1.2)
Secondary measures
Expectations to follow guidelines	4.23 (0.9)	4.18 (0.8)	4.25 (0.9)	4.32 (0.9)	4.19 (0.8)	4.30 (0.8)
Confidence in understanding	4.17 (0.8)	4.35 (0.8)	4.23 (0.8)	4.32 (0.8)	4.24 (0.8)	4.29 (0.8)
Perceived testing accuracy	5.71 (1.1)	5.71 (1.1)	5.61 (1.1)	5.95 (1.0)	5.75 (1.1)	5.74 (1.1)
Future testing expectations	5.90 (1.6)	5.92 (1.6)	5.88 (1.6)	5.99 (1.6)	5.90 (1.6)	5.95 (1.6)

*Correct understanding of residual risk. Confidence is on a five-point scale and other continuous variables on a seven-point scale.

NHS, National Health Service; T&T, Test and Trace.