Table 2. Plasma 25-hydroxyvitamin D levels and NSCLC patients survival.

Group	Vitamin D Level (nnmol/L)	N	Ajusted HR (95% CIs)*	P
1	< 25.36	22	1.00
2	25.36 - 37.72	22	1.47 (0.58-3.73)	0.415
3	37.72 - 56.54	22	1.59 (0.75-3.39)	0.225
4	≥ 56.54	21	2.54 (1.01-6.41)	0.048
Trend			1.31 (1.00-1.72)	0.048

*Adjusted for age, gender, smoking status, stage, histology, surgical operation and chemotherapy or radiation treatment.