Table 3.

Fixed and random effect structure as a summary of the Flanker Task linear mixed model

Predictors	Log transformed reaction times
	Estimates	CI	p	DF
(Intercept)	6.72	6.66 to 6.78	< 0.001	73.03
Trial Type [incongruent]	0.12	0.10 to 0.14	< 0.001	2928.48
Age	− 0.08	− 0.15 to − 0.00	0.040	69.90
IQ	− 0.16	− 0.24 to − 0.09	< 0.001	70.97
Bilingual exposure	0.06	− 0.00 to 0.12	0.051	70.20
Random effects
σ2	0.08
τ00	0.06
ICC	0.46
N	74
Observations	2988
Marginal R2/Conditional R2	0.27/0.60

Bold comparisons indicate significant differences between groups at the 0.05 threshold

The conditional R² of 0.60 accounts for the variance explained by the whole model, where the marginal R² of 0.27 reflects only the contribution of the fixed effects