The annual percent change is significantly different from zero at the alpha level of 0.05 if its 95% CI does not include zero, which is hereinafter referred to as a significant trend.
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Trend in Alcohol-related Crashes Before and After the Introduction of Mandatory Breath Testing Among Commercial Truck Drivers.
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The sentences
The proportion showed a decreasing trend of −10.6% (95% CI, −21.7 to 2.0%) until 1998, followed by an increasing trend of 22.6% (95% CI, −6.4 to 60.5%) until 2001, then a significant decreasing trend of −13.5% (95% CI, −15.8 to −11.1%) until 2012, and an increasing trend of 5.1% (95% CI, −1.7 to 12.3%) until 2020.