a decreasing trendP ≥ 0.05
an increasing trendP value < 0.05
If AAPC > 0 and P value < 0.05, the age-standardized rate indicates an increasing trend during this study period; otherwise, if AAPC < 0 and P value < 0.05, the age-standardized rate indicates a decreasing trend; if P ≥ 0.05, the rate indicates an unchanged trend.