TABLE 6.

Cohort 1: results of ME growth models for changes in ANS RT (in sec.) from grade 1 to grade 5.

Variables	Baseline	Model 1	Model 2	Model 3
	Intercept-only	Linear growth	Non-linear growth	Model with random slope
	B (s.e.)	B (s.e.)	B (s.e.)	B (s.e.)
Fixed effect
Constant	1.22*** (0.02)	1.49*** (0.02)	1.52*** (0.02)	1.49*** (0.03)
Time		−0.13*** (0.01)	−0.17*** (0.02)	−0.13*** (0.01)
Time2			0.01 (0.01)
Random effect
Intercept variance	0.04	0.05	0.05	0.15
Residuals	0.11	0.08	0.08	0.06
Slope variance (time)				0.01
Covariance between intercept and slope (time)				−0.03
Log-likelihood	−469.16	−300.47	−298.65	−245.37
LR test (Δ df)		337.38*** (1)	3.65 (1)	112.46*** (2)
ICC	0.26

***p < 0.001.