If β <0 and the upper limit of the 95% CI <0, the burden was considered to have a decreasing trend.
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Global burden of vision impairment due to smoking-related cataract: A descriptive study of spatiotemporal trends based on GBD secondary data and projections to 2050.
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The sentences
The direction of the trend was determined based on the value of β and its 95% confidence interval (CI): If β >0 and the lower limit of the 95% CI >0, the burden was considered to have an increasing trend.