3.2.3. Short sleep effect: by cognitive domain The effect sizes of self-reported short sleep appeared to vary across cognitive domains (Table 2).
Short sleep was significantly associated with poorer performance in multiple-domain tasks (OR = 1.28, 95% CI = 1.07–1.53).
Since we assumed that impairment in multiple cognitive domains was associated with AD and dementia, to determine whether these clinical conditions might have inflated the risk for poor performance in this domain, we also calculated a pooled OR excluding the two relevant studies [11,22].
This OR was of a similar magnitude and remained statistically signifi-cant (OR = 1.24, 95% CI = 1.02–1.50).