a decreasing trendp-value <0.05
The annual percentage change (APC) of the total period for each group of procedures and their respective 95%CI was calculated using the following equations, respectively: 17 A P C = ( 1 + 10 b 1 ) * 100 % 95 % C I = ( - 1 + 10 b 1 m í n ) * 100 % ; ( - 1 + 10 b 1 m á x ) * 100 % Dental production was considered having an upward trend when the regression coefficient was positive and the p-value <0.05; a decreasing trend when the regression coefficient was negative and p-value <0.05; and a stationary trend when there was no statistical significance.