Table 1 Patient characteristics for the overall population as well as stratified by 2 serum vitamin D categories

Gender

0.85

 Male

181

77 (42.5)

104 (57.5)

 Female

178

74 (41.6)

104 (58.4)

Stage

0.90

 III

94

39 (41.5)

55 (58.5)

 IV

265

112 (42.3)

153 (57.7)

CTCA hospital

0.04*

 Philadelphia, PA

50

13 (26)

37 (74)

 Zion, IL

269

119 (44.2)

150 (55.8)

 Tulsa, OK

40

19 (47.5)

21 (52.5)

Histologic subtype^a

0.90

 Adenocarcinoma

268

114 (42.5)

154 (57.5)

 Squamous cell

67

28 (41.8)

39 (58.2)

 Others

19

9 (47.4)

10 (52.6)

SGA^a

0.07

 Well-nourished

211

81 (38.4)

130 (61.6)

 Moderately-severely malnourished

124

60 (48.4)

64 (51.6)

ECOG score^a

0.02*

 0–1

233

88 (37.8)

145 (62.2)

 2–4

102

52 (51)

50 (49)

Season of diagnosis

0.004*

 Summer

93

34 (36.6)

59 (63.4)

 Fall

90

27 (30)

63 (70)

 Winter

72

34 (47.2)

38 (52.8)

 Spring

104

56 (53.8)

48 (46.2)

Smoking Status^a

0.006*

 Never

69

27 (39.1)

42 (60.9)

 Former

143

49 (34.3)

94 (65.7)

 Current

143

75 (52.4)

68 (47.6)

Vitamin D supplementation at diagnosis

0.92

 Yes

163

69 (42.3)

94 (57.7)

 No

196

82 (41.8)

114 (58.2)

Continuous variables

Overall population (n = 359)

Deficient: <20 ng/ml (n = 151)

Not deficient: > = 20 ng/ml (n = 208)

P-value

 Mean (SD) age (years)

57.4 (8.4)

57.1 (7.4)

57.6 (9.0)

0.62

 Mean (SD) vitamin D (ng/ml)

25.5 (15.3)

13.3 (4.1)

34.4 (14.3)

<0.001*

 Mean (SD) BMI (kg/m2)

25.8 (5.7)

25.5 (5.9)

26 (5.7)

0.43

 Mean (SD) serum albumin (g/dl)

3.6 (0.57)

3.5 (0.57)

3.6 (0.57)

0.06