Table 2 Median survival as a function of patient characteristics

Serum vitamin D

0.06

 > = 20 ng/ml

12.8

10.8–14.7

 <20 ng/ml

11.7

8.6–14.7

Gender

0.04*

 Male

11.7

10.2–13.2

 Female

13.5

11.2–15.8

Stage

<0.001*

 III

20.1

12.9–27.3

 IV

10.8

9.2–12.4

CTCA hospital

<0.001*

 Philadelphia, PA

38.2

4.1–72.3

 Zion, IL

12.4

10.6–14.1

 Tulsa, OK

7.4

4.2–10.5

Histologic subtype

0.002*

 Adenocarcinoma

12.8

11.2–14.4

 Squamous cell

11.8

7.7–15.9

 Others

7.2

3.7–10.7

SGA

<0.001*

 Well–nourished

15.2

12.1–18.3

 Moderately-severely malnourished

8.0

6.2–9.9

ECOG score

<0.001*

 0–1

14.3

12.1–16.5

 2–4

8.0

6.2–9.8

Season of diagnosis

0.73

 Summer

11.6

8.4–14.8

 Fall

11.7

8.3–15.1

 Winter

12.6

8.9–16.3

 Spring

12.7

10.2–15.3

Smoking status

0.02*

 Never

19.4

10.8–27.9

 Former

11.0

9.4–12.6

 Current

11.7

9.3–14.1

Vitamin D supplementation at diagnosis

0.27

 Yes

13.6

12.4–14.9

 No

10.6

8.9–12.5