Therefore, the p-values should be considered as approximately correct. The slope estimates from log-linear segments were used to estimate annual percent changes (APC) and average annual percent changes (AAPC). APC was presented for each line segment connected at the joinpoint(s). In the presence of multiple line segments, AAPC was presented for the average of the APCs over the whole period weighted by the length of the APC interval. In the case of single line segments, AAPC was identical to APC.
