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Table 2 Causes of head injury in the acute and persistent PTH group

From: Exploring naturally occurring clinical subgroups of post-traumatic headache

Cause of Head Injury

Acute PTH

Persistent PTH

Statistical Difference

Motor Vehicle Accident: n (%)

25 (16%)

46 (31%)

OR = 2.2

95% CI 1.3, 3.8

p = 0.0048

Fall: n (%)

65 (44%)

57 (38%)

OR = 0.8

95% CI 0.5, 1.2

p = 0.35

Direct trauma to the head by an object: n (%)

60 (40%)

47 (31%)

OR = 0.8

95% CI 0.5, 1.2

p = 0.26

  1. OR odds ratio, CI confidence interval. Statistically significant differences are displayed in bold