Table A4. LMEM of spacing effect, including covariate of Age.

Formula: accuracy ^~ Length + Session*ISI*RI*Age + (1 + Length + Frequency + Session + ISI*RI + Session:ISI + Session:RI | participant) + (1 | item)

Predictor:	Estimate	Std. Error	z-value	Pr(>|z|)	value
(Intercept)	3.190	0.450	7.086	< 0.001	***
Word Length	−0.338	0.120	−2.811	0.005	**
Word Frequency	0.242	0.074	3.259	0.001	**
Session	1.514	0.324	4.676	< 0.001	***
ISI	−0.496	0.126	−3.921	< 0.001	***
RI	−0.390	0.137	−2.847	0.004	**
Age	−0.416	0.192	−2.165	0.030	*
Session:ISI	−0.258	0.108	−2.396	0.017	*
Session:RI	−0.370	0.114	−3.240	0.001	**
ISI:RI	0.143	0.066	2.157	0.031	*
Session:Age	−0.142	0.093	−1.523	0.128
ISI:Age	0.047	0.062	0.761	0.447
RI:Age	0.062	0.067	0.925	0.355
Session:ISI:RI	−0.012	0.024	−0.523	0.601
ISI:RI:Age	−0.020	0.027	−0.742	0.458

Signif. codes: 0.001

^***0.01

^**0.05

^*.0.1