Table 2 Univariate analysis of severe headache

Age

 <18 y

1688 (76.38%)

1

 >=18 y

522 (23.62%)

1.00 (0.80, 1.25)

0.9896

Gender

 Male

1093 (49.46%)

1

 Female

1117 (50.54%)

1.45 (1.20, 1.75)

0.0001

Race

 Mexican American

699 (31.63%)

1

 Other Hispanic

100 (4.52%)

1.72 (1.11, 2.68)

0.0161

 Non-Hispanic White

655 (29.64%)

0.92 (0.71, 1.18)

0.5028

 Non-Hispanic Black

673 (30.45%)

1.35 (1.07, 1.71)

0.013

 Other race

83 (3.76%)

1.17 (0.70, 1.96)

0.5369

BMI

23.58 ± 5.74

1.03 (1.01, 1.05)

0.0002

PIR

2.17 ± 1.54

0.91 (0.86, 0.97)

0.0059

CRP

0.18 ± 0.44

1.08 (0.88, 1.32)

0.4591

Neutrophils

3.97 ± 1.72

1.00 (0.95, 1.06)

0.9869

Lymphocyte

2.23 ± 0.62

1.02 (0.88, 1.19)

0.7584

WBC

7.00 ± 2.07

1.00 (0.96, 1.05)

0.9215

IBI quartile

 Q1

551 (24.93%)

1

 Q2

554 (25.07%)

1.23 (0.93, 1.61)

0.1421

 Q3

552 (24.98%)

1.08 (0.82, 1.42)

0.585

 Q4

553 (25.02%)

1.46 (1.12, 1.91)

0.0051

LDH

136.00 ± 30.64

1.00 (1.00, 1.00)

0.2675

LDL.

164.23 ± 31.39

1.00 (1.00, 1.01)

0.0899

HDL.

49.83 ± 11.70

1.00 (0.99, 1.00)

0.2335