Table 3.

Marginal Means of Dependent Variables by Treatment.

		Vaccine Efficacy			Self-Efficacy			Vaccine Risk			Vaccination Willingness
Treatment	n	M [95% CI]	SD	t(n–1)	M [95% CI]	SD	t(n–1)	M [95% CI]	SD	t(n–1)	M [95% CI]	SD	t(n–1)
Next week	74	3.57 [3.42, 3.73]	0.70	7.09	3.37 [3.20, 3.54]	0.75	4.23	2.86 [2.70, 3.01]	0.66	−1.86 ns	3.51 [3.30, 3.73]	0.94	4.71
One year	68	3.92 [3.75, 4.09]	0.71	10.71	3.43 [3.25, 3.62]	0.77	4.67	2.58 [2.41, 2.74]	0.67	−5.18	3.70 [3.48, 3.93]	0.95	6.10
Two years	74	3.80 [3.65, 3.96]	0.69	10.08	3.66 [3.49, 3.83]	0.74	7.63	2.68 [2.53, 2.83]	0.65	−4.26	3.70 [3.49, 3.91]	0.92	6.52
Overall	216	3.76 [3.66, 3.86]	0.75	14.90	3.49 [3.39, 3.60]	0.80	9.01	2.71 [2.61, 2.80]	0.71	−6.04	3.64 [3.50, 3.77]	0.99	9.46

Note. M = marginal mean controlling for covariates. SD = standard deviation of the mean. t(n–1) is the one-sample t-value with n-1 degrees of freedom. The one-sample t-test compares mean scores against a test value of 3, which was the middle response option on the measurement items. ^ns = not significant. All other t-values are significant at p < .001 (two-tailed).