Table 2.

DTI index analysis of affected facial nerve and the healthy nerve in patients (mean ± SD).

	Healthy side (N = 19)	Affected side (N = 19)	P value
FA
FA(19-Patient-MPM)	0.311 ± 0.053	0.281 ± 0.069	0.011 (t = 2.832)
FA(37-All-MPM)	0.309 ± 0.050	0.278 ± 0.067	0.011 (t = 2.832)
MD
MD(19-Patient-MPM)	1.005 ± 0.152	1.084 ± 0.212	0.019 (t = 0.019)
MD(37-All-MPM)	1.005 ± 0.152	1.097 ± 0.214	0.023 (t =  − 2.487)
AD
AD(19-Patient-MPM)	0.00120 ± 0.00014	0.00126 ± 0.00019	0.114 (t = 0.114)
AD(37-All-MPM)	0.00120 ± 0.00015	0.00128 ± 0.00020	0.130 (t =  − 1.586)
RD
RD(19-Patient-MPM)	0.00078 ± 0.00012	0.00088 ± 0.00018	0.010 (t = 0.010)
RD(37-All-MPM)	0.00079 ± 0.00012	0.00089 ± 0.00018	0.012 (t =  − 2.788)

MD—the unit is 10⁻³ mm²/s.