Apparent Diffusion Coefficient of Diffusion-Weighted Imaging in Evaluation of Cervical Intervertebral Disc Degeneration: An Observational Study with 3.0 T Magnetic Resonance Imaging

Table 3

ADC values of asymptomatic and symptomatic volunteers according to Pfirrmann grade.

Pfirrmann grade	Symptomatic patients		Asymptomatic volunteers
	Number	ADC mean value (×10^−3 mm^2/sec)	Number	ADC mean value (×10^−3 mm^2/sec)
I	29	2.19 ± 0.18	44	2.45 ± 0.11
II	55	2.05 ± 0.19	52	2.32 ± 0.17
III	88	1.98 ± 0.15	63	2.16 ± 0.20
IV	64	1.88 ± 0.19	36	1.94 ± 0.16
V	24	1.72 ± 0.26	5	1.86 ± 0.24
Total	260	1.91 ± 0.23	200	2.18 ± 0.18

NP: nucleus pulposus, compared with ADC values of grade I discs of symptomatic volunteers, ; compared with ADC values of grade II discs of symptomatic volunteers, ; compared with ADC values of grade III discs of symptomatic volunteers, ; compared with ADC values of grade V discs of symptomatic volunteers, ; compared with ADC values of grade I discs of asymptomatic volunteers, ; compared with ADC values of grade II discs of asymptomatic volunteers, ; compared with ADC values of grade III discs of asymptomatic volunteers, .