Table A1. Beta Coefficients in the Mediation Analysis for Study 1.

	Children			Adults aged 18–50			Older adults
Effect	β	b [95% CI]	p	β	b [95% CI]	p	β	b [95% CI]	p
Note. A negative coefficient reflects lower probability perceptions and less advice to stay home for the risk message compared to the control group where participants did not see the message. Letters reflect the pathways in the mediation model illustrated in Figure A1.
Effect of risk message on probability perceptions (a)
Infection	−0.24	−7.29 [−13.36, −1.21]	.019	−0.13	−4.14 [−10.48, 2.20]	.200	0.02	0.54 [−6.33, 7.42]	.876
Severe symptoms	−0.01	−0.15 [−4.38, 4.08]	.944	0.01	0.27 [−4.00, 4.55]	.900	−0.001	−0.03 [−6.13, 6.07]	.992
Direct effect on recommendations to stay home of:
Risk message (c’)	−0.14	−0.12 [−0.27, 0.04]	.149	−0.11	−0.07 [−0.21, 0.06]	.290	0.01	0.004 [−0.10, 0.10]	.935
Probability perception (b)
Infection	0.06	0.002 [−0.001, 0.004]	.309	0.08	0.002 [−0.001, 0.004]	.183	0.11	0.002 [−0.0001, 0.003]	.059
Severe symptoms	0.14	0.01 [0.001, 0.01]	.014	0.09	0.003 [−0.001, 0.007]	.098	−0.05	−0.001 [−0.003, 0.001]	.381
Indirect (mediated) effect of risk message on advice to stay home (ab)	—	−0.01 [−0.06, 0.03]	—	—	−0.01 [−0.03, 0.02]	—	—	−0.0001 [−0.01, 0.02]	—
Mediation by infection probability perception	—	−0.01 [−0.05, 0.01]	—	—	−0.01 [−0.03, 0.01]	—	—	0.001 [−0.01, 0.02]
Mediation by severe symptoms probability perception	—	−0.001 [−0.03, 0.03]	—	—	0.01 [−0.02, 0.02]	—	—	−0.0003 [−0.01, 0.01]