Table 2.

Optimal models data and parameters for all regions of $SU{V}_{\mathit{mean}}$ analysis. The quadratic and cubic models are represented by the equations ${\mathit{SUV}}_{\mathit{mean}}(age)=A+B\ast age+C\ast {\mathit{age}}^2$ and ${\mathit{SUV}}_{\mathit{mean}}(age)=A+B\ast age+C\ast {\mathit{age}}^2+D\ast {\mathit{age}}^3$, respectively. Each fit parameter is associated with its error fit value

Region	Frontal lobe	Temporal lobe	Parietal lobe	Occipital lobe	Central structures	Insula	Cerebellum	Whole brain	Cingulate gyrus	Brainstem
	Cubic	Quadratic	Cubic	Cubic	Quadratic	Cubic	Cubic	Quadratic	Cubic	Cubic
Adjustment parameters
A	1.815 ± 0.395	1.471 ± 0.255	1.912 ± 0.39	2.053 ± 0.481	1.645 ± 0.272	1.913 ± 0.367	1.783 ± 0.337	1.713 ± 0.311	1.843 ± 0.452	1.427 ± 0.254
B	0.3528 ± 0.2073	0.2834 ± 0.0696	0.3319 ± 0.2048	0.4532 ± 0.2519	0.3201 ± 0.0742	0.2849 ± 0.1925	0.2493 ± 0.1771	0.369 ± 0.0396	0.3619 ± 0.2372	0.1366 ± 0.1333
C	− 0.0016 ± 0.0288	− 0.0063 ± 0.004	0.0009 ± 0.0267	− 0.0062 ± 0.035	− 0.0062 ± 0.0042	0.0032 ± 0.0203	0.0019 ± 0.0208	− 0.0087 ± 0.0072	− 0.0004 ± 0.033	0.0077 ± 0.003
D	− 0.0003 ± 0.0011		− 0.0005 ± 0.0011	− 0.0003 ± 0.0014		− 0.0004 ± 0.001	− 0.0003 ± 0.001		− 0.0004 ± 0.0013	− 0.0004 ± 0.0007
Adjustment data
Degrees of freedom	14	15	14	14	15	14	14	15	14	14
${\mathrm{R}}^2$	0.9723	0.9669	0.9711	0.9703	0.974	0.9735	0.9705	0.9709	0.9686	0.9747
RMSE	0.2155	0.177	0.2129	0.2619	0.1888	0.2002	0.184	0.2075	0.2467	0.1386
AIC	− 41.28	− 52.28	− 41.71	− 34.26	− 49.96	− 43.94	− 46.97	− 46.56	− 36.42	− 57.18