Figure 2. Trajectories of cognitive change among 2300 Taiwanese elderly individuals, 1993–2007, assessed by Short Portable Mental Scale Questionnaire (SPMSQ).

The observed trajectory is displayed by a solid line, and the predicted trajectory is shown by a dashed line. The SPMSQ score was modified by Least Squares Means, and there was significant interaction between SPMSQ score and year (p < 0.001). *Significant difference in comparison to the 1993 survey in each group after Bonferroni adjustment (p < 0.0125). ^†Significant difference in comparison with the high-stable group in each survey after Bonferroni adjustment (p < 0.025).