In the sub-analysis, ORs of each antihypertensive drug for the incidence of delirium were as follows: ACE inhibitors, OR: 0.83, 95% CI: 0.22–3.13; ARBs, OR: 0.58, 95% CI: 0.33–1.01; β blockers, OR: 1.26, 95% CI: 0.62–2.56; CCBs, OR: 0.76, 95% CI: 0.47–1.24; and Thiazides, OR: 1.35, 95% CI: 0.48–3.80 (Table 4). Here, ACE is linked to delirium.