Reading, playing board games, playing musical instruments, dancing
Meta-anlaysis of 32 cohort studies on cognitive reserve and dementia : (Job, Education, IQ, Mental activities)
High cognitive reserve compared to low was 0.54 (95%CI 0.49–0.59, p<0.0001) – i.e. decreased risk of 46%.
Valenzuela MJ , et al. Psychol Med. 2006;36(4):441-54.