Table 1.

Mean, minimum, and maximum ADC values for the NPC cases analyzed according to various clinical characteristics

Factors	N (Total = 93)	ADC values			P-value
		Minimum	Maximum	Mean ± SD
Age					0.83
< 50 y	37	0.52	0.92	0.73 ± 0.11
≥ 50 y	56	0.48	0.97	0.72 ± 0.10
Gender					0.28
Male	69	0.48	0.97	0.72 ± 0.10
Female	24	0.57	0.92	0.74 ± 0.10
Smoking status					0.30
Yes	46	0.57	0.92	0.73 ± 0.09
No	47	0.48	0.97	0.71 ± 0.11
Alcohol intake					0.75
Yes	58	0.48	0.92	0.73 ± 0.09
No	35	0.58	0.97	0.72 ± 0.11
Pathological type*					0.51
1	8	0.61	0.97	0.79 ± 0.13
2	39	0.57	0.96	0.72 ± 0.10
3	30	0.48	0.97	0.72 ± 0.10
4	16	0.59	0.83	0.70 ± 0.06
Tumor stage					0.53
T1	15	0.48	0.92	0.71 ± 0.14
T2	48	0.57	0.97	0.73 ± 0.09
T3	17	0.59	0.95	0.74 ± 0.10
T4	13	0.59	0.85	0.69 ± 0.07
Nodal stage					0.022
N0	10	0.52	0.84	0.66 ± 0.08
N1	16	0.47	0.97	0.72 ± 0.12
N2	63	0.57	0.95	0.73 ± 0.09
N3	4	0.64	0.97	0.81 ± 0.13

ADC: apparent diffusion coefficient; NPC: nasopharyngeal carcinoma; SD: standard deviation

*Type1: keratinizing squamous cell carcinoma; Type 2: poorly differentiated non-keratinizing carcinoma; Type 3: well differentiated non-keratinizing carcinoma; Type 4: undifferentiated carcinoma