. 2020 Oct 9;8(6):419–431. doi: 10.1007/s40336-020-00393-x

Table 2.

Mixed-effects generalised linear modeling showing the unadjusted, multivariable and bootstrapped multivariable effect estimates of co-variables on fractional anisotropy and mean diffusivity of the roots of the brachial plexus

DTI parameter	Experimental factors	Unadjusted coefficients (95% CI)	p value	Adjusted coefficients (95% CI)	p value	Resampled adjusted coefficients (95% CI)	Resampled p value
Fractional anisotropy	SNR	0.0001 (− 0.0003, 0.0004)	0.662	0.0001 (− 0.0001, 0.0004)	0.257	0.0001 (− 0.001, 0.002)	0.840
	Age in years	0.0003 (− 0.006, 0007)	0.926	0.001 (0.001, 0.002)	0.001	0.001 (− 0001, 0.003)	0.236
	Number of diffusion directions	− 0.002 (− 0.005, 0001)	0.183	− 0.001 (− 0.002, − 0.001)	< 0.001	− 0.001 (− 0.002, − 0.0004)	0.002
	Echo time (ms)	0.002 [0.00001, 0.004])	0.174	^a	^a	^a	^a
	b value (mm/s)	− 0.0004 (− 0.001, 0.0001)	0.098	^a	^a	^a	^a
	Resolution (mm³)	0.008 (0.003, 0.013)	0.126	^a	^a	^a	^a
Mean diffusivity (mm²/s × 10^–3)	SNR	− 0.001 (− 0.003, 0.0005)	0.154	− 0.001 (− 0.003, 0)	0.055	− 0.001 (− 0.012, 0.01)	0.799
	Age in years	− 0.01 (− 0.03, 0.01)	0.303	− 0.025 (− 0.030, − 0.021)	< 0.001	− 0.03 (− 0.042, − 0.01)	0.003
	Number of diffusion directions	0.005 (− 0003, 0013)	0.234	0.001 (− 0.001, 0.002)	0.238	0.001 (− 0.005, 0.006)	0.723
	Echo time (ms)	− 0.012 (− 0.019, − 0.005)	0.174	^a	^a	^a	^a
	b value (mm/s)	0.001 (0.0004, 0.002)	0.003	^a	^a	^a	^a
	Resolution (mm³)	0.004 (0.002, 0.007)	0.562	^a	^a	^a	^a

^aExcluded due to multicollinearity