Sleep apnoea and risk of cognitive impairment or dementia.

Table 3: Sleep apnoea and risk of cognitive impairment or dementia.

Study	Exposure	Outcome	Follow Up (Years)	Results
Elwood [36]	Sleep apnoea (WSQ)	Vascular dementia or CI	10	Adj OR 2.34 (95%CI 1.24 to 4.41)
Elwood [36]	Sleep apnoea (WSQ)	Non-vascular dementia or CI	10	Adj OR 1.02 (95%CI 0.61 to 0.69)
Tsai [40]	Obstructive sleep apnoea (ICD-9-CM)	Alzheimer disease	5.5	Adj HR 2.12 (95% CI 1.27 to 3.56)
Yaffe [41]	Apnoea-hypopnea index (polysomnography)	Mild CI or dementia	4.7	Adj OR 2.36 (95% CI 1.34 to 4.13)
Yaffe [43]	Sleep apnoea (ICD-9-CM)	Dementia	8	Adj HR 1.23 (95% CI 1.14 to 1.33)

WSQ: Wisconsin Sleep Questionnaire; CI: Cognitive Impairment. In bold statistically significant results