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Table 1 Clinical features of acute and persistent PTH patients included in the study

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

Clinical VariablesAcute PTH (n = 150)Persistent PTH (n = 150)Statistical Difference
Age, years: median (IQR)44 (28, 59)50 (36, 58)Mann-Whitney p = 0.16
Female:Male ratio2.82.5Chi-squared p = 0.60
Duration of PTH, months: median (IQR)0.7 (0.23, 1)24 (12, 48)Mann-Whitney
p < 0.00001
History of migraine: n (%)8 (5%)59 (40%)RR = 2.4
95% CI 2, 3
p < 0.0001
Previous head injury: n (%)8 (5%)37 (25%)OR = 5.8
95% CI 2.6, 13
p < 0.0001
Loss of consciousness: n (%)12 (8%)32 (21%)OR = 3.1
95% CI: 1.5, 6.3
p = 0.0016
Medication overuse: n (%)1 (0.007%)58 (39%)RR = 2.6
95% CI: 2.2, 3.0
p < 0.0001
Pre-existing psychological history: n (%)27 (18%)78 (52%)OR = 5
95% CI 3, 8.3
p < 0.0001
New PTH-associated comorbidities: n (%)103 (69%)147 (98%)RR = 9.8
95% CI 3.3, 29.5
p < 0.0001
  1. Abbreviations: IQR interquartile range, OR odds ratio, RR relative risk, CI confidence interval. Statistically significant differences are displayed in bold
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