Table 2.

Results of a two-level linear mixed model for longitudinal change in (a) Gf and (b) Gc.

(a)
Gf	Estimate	SE	df	t	Pr(> |t|)	Confidence Interval
						2.50%	97.50%
(Intercept)	23.36	0.52	89.75	44.67	<0.001	22.28	24.42
Time	−0.21	0.11	92.14	−2.01	0.048	−0.43	0.00
Re-test	1.49	0.56	97.83	2.65	0.009	0.43	2.69
Age at baseline	−0.20	0.06	76.40	−3.58	0.001	−0.32	−0.07
Time × baseline age	−0.01	0.01	93.81	−1.65	0.103	−0.03	0.00

(b)
Gc	Estimate	SE	df	t	Pr(> |t|)	Confidence Interval
						2.50%	97.50%
(Intercept)	26.98	0.86	82.57	31.48	<0.001	25.21	28.70
Time	−0.09	0.13	91.96	−0.66	0.510	−0.34	0.22
Re-test	0.46	0.70	95.04	0.65	0.514	−1.00	1.91
Age at baseline	0.02	0.10	75.69	0.18	0.861	−0.17	0.20
Time × Age at baseline	0.00	0.01	92.91	−0.34	0.734	−0.03	0.02