did not reach statistical significancep value=0.10
An exploratory analysis observed that the HR was higher among those who were never smokers (HR=4.01; 95% CI 1.81 to 8.86) than ever smokers (HR=1.75; 95% CI 0.88 to 3.45); however, the interaction between smoking and PD did not reach statistical significance (p value=0.10).