highly significantp < 0.01
P-value was considered statistically significant if p < 0.05 and considered statistically highly significant if p < 0.01.
P-value was considered statistically significant if p < 0.05 and considered statistically highly significant if p < 0.01.
The results showed that the prevalence of MCI was insignificantly higher at the age of 50-55 years (P > 0.05), which contradicts previous results that showed a trend that the prevalence of MCI increased with increasing age [ 28 ].