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. Author manuscript; available in PMC: 2016 Jun 1.
Published in final edited form as: Ann Neurol. 2015 Mar 28;77(6):987–995. doi: 10.1002/ana.24396

Figure 2. The Role of Time Lag from Trauma to PD diagnosis, Trauma Mechanism (Falls vs. Non-Falls), TBI Severity, and TBI Frequency.

Figure 2

Excluding PD diagnosis rendered less than one year (primary analysis), less than two years, or less than three years after trauma led to essentially equivalent results. Analyzing only trauma to due to falls versus only trauma due to non-falls produced equivalent results (p-value in figure is for interaction term for TBI*fall). Risk of PD after moderate/severe TBI was significantly greater than risk of PD after mild TBI (p-value in figure is for Wald test). After excluding NTT cases who went on to suffer a TBI and then stratifying TBI cases by those with only one TBI versus those who went on to suffer an additional TBI during the study period, risk of PD after more than one TBI was significantly greater than risk of PD after one TBI (p-value in figure is for Wald test). Error bars are 95% confidence intervals.