Mimicry boosts social bias: unrealistic optimism in a health prevention case

Figures & data

Figure 1. Unrealistic optimism bias in the mimicry and no mimicry condition.

Note: Dots represent means. Vertical bars represent standard errors.

Table 1. Descriptive statistics of all study variables.

										Shapiro – Wilk
Variables	N	M	SD	Me	Mo	Min.	Max.	Sk.	Kurt.	S-W	p
Mimicry
Me	121	6.51	2.80	6.00	9.00	1.00	11.00	−0.18	−1.00	.95	<.001
My friend	121	7.20	2.40	7.00	9.00	1.00	11.00	−0.32	−0.61	.96	<.001
No-mimicry
Me	133	5.30	2.40	5.00	5.00	1.00	11.00	0.55	−0.19	.95	<.001
My friend	133	6.15	2.29	6.00	5.00	1.00	11.00	0.29	−0.67	.95	<.001

Table 2. Post-hoc comparisons with Bonferroni correction adjusted for comparing a family of six estimates.

	Mean Difference	Mean Difference 95% CI	SE	t	pbonf	Cohen’s d	Cohen’s d 95% CI
Mimicry, Me
Mimicry, My friend	−0.69	[−1.11; −0.26]	0.16	−4.32	<.001	−0.28	[−0.45; −0.1]
No mimicry, Me	1.21	[0.39; 2.04]	0.31	3.9	<.001	0.49	[0.15; 0.83]
No mimicry, My friend	0.36	[−0.46; 1.19]	0.31	1.16	.999	0.15	[−0.19; 0.48]
No mimicry, Me
No mimicry, My friend	−0.85	[−1.25; −0.45]	0.15	−5.61	<.001	−0.34	[−0.51; −0.18]
Mimicry, My friend	−1.9	[−2.72; −1.07]	0.31	−6.11	<.001	−0.77	[−1.11; −0.42]
Mimicry, My friend
No mimicry, My friend	1.05	[0.22; 1.87]	0.31	3.37	.005	0.42	[0.09; 0.76]

Note. p-value and 95% CI adjusted for comparing a family of 6.

Data availability statement

Databases and statistical protocols are publicly available at the Open Science Framework: https://osf.io/n35dc/).