Table 4.

Fixed and random effect structure as a summary of the Psychomotor Vigilance Task mixed effects logistic regression

Predictors	False starts
	Odds ratios	CI	p
(Intercept)	0.01	0.01–0.03	< 0.001
Age	0.41	0.20–0.83	0.014
IQ	2.46	1.22–4.99	0.012
Bilingual exposure	0.19	0.11–0.34	< 0.001
Random effects
σ2	3.29
τ00	3.75
ICC	0.53
N	66
Observations	2828
Marginal R2/Conditional R2	0.28/0.66

Bold comparisons indicate significant differences between groups at the 0.05 threshold

*An odds ratio greater than 1 describes a positive relationship between variables whereas an odds ratio less than 1 describes a negative relationship