Table 3. Fitting results for FA, ODI, and NDI in each set of JHU tracts using four different two-parameter models: linear, logarithmic, exponential decay, exponential growth.

	R (lin)	p (lin)	R (log)	p (log)	R (exp decay)	p (exp decay)	R (exp grow)	p (exp grow)
FA
All JHU	0.253	0.040	0.314	0.010	0.379	0.0017	0.252	0.041
Projection (non-brainstem)	0.152	0.22	0.195	0.12	0.289	0.018	0.152	0.22
Association	0.233	0.059	0.289	0.018	0.376	0.0018	0.232	0.060
Limbic	0.511	1.2E-05	0.552	1.6E-06	0.489	3.1E-05	0.508	1.3E-05
Projection (brainstem)	0.501	1.8E-05	0.577	4.0E-07	0.548	1.9E-06	0.498	2.1E-05
Callosal	0.012	9.3E-01	0.053	0.67	0.224	0.071	0.012	0.93
Cerebellar	0.343	0.0048	0.399	9.1E-04	0.357	0.0033	0.341	0.0050
ODI
All JHU	0.505	1.5E-05	0.468	7.5E-05	0.157	0.21	0.505	1.5E-05
Projection (non-brainstem)	0.470	7.0E-05	0.462	9.6E-05	0.212	0.087	0.469	7.3E-05
Association	0.286	0.020	0.223	0.073	0.000	1.0E+00	0.287	0.019
Limbic	0.286	0.020	0.260	0.035	0.095	0.45	0.287	0.020
Projection (brainstem)	0.613	4.5E-08	0.614	4.2E-08	0.464	8.7E-05	0.610	5.5E-08
Callosal	0.409	6.6E-04	0.345	0.0045	0.000	1.0E+00	0.412	5.8E-04
Cerebellar	0.370	0.0022	0.352	0.0038	0.196	0.12	0.370	0.0022
NDI
All JHU	0.711	2.3E-11	0.770	4.3E-14	0.736	1.9E-12	0.704	4.3E-11
Projection (non-brainstem)	0.659	1.8E-09	0.722	8.0E-12	0.704	4.2E-11	0.652	3.1E-09
Association	0.680	3.3E-10	0.729	3.8E-12	0.695	9.8E-11	0.675	5.0E-10
Limbic	0.827	0.0E+00	0.866	0.0E+00	0.793	2.1E-15	0.817	1.1E-16
Projection (brainstem)	0.791	2.7E-15	0.856	0.0E+00	0.839	0.0E+00	0.780	1.2E-14
Callosal	0.428	3.3E-04	0.480	4.5E-05	0.485	3.7E-05	0.425	3.7E-04
Cerebellar	0.751	3.6E-13	0.783	8.1E-15	0.671	6.8E-10	0.746	6.5E-13