Table 4.

Final model for the Functional Outcomes of Sleep Questionnaire total score

Variable	B estimate for transformed outcome	95% CI	B estimate on original scale	P-value
Cohort				<0.001
Cognitively impaired + /sleepy +	–62.7	–83.3 to –42.2	–7.9	<0.001
Cognitively impaired–/sleepy +	–44.8	–65.2 to –24.4	–6.7	<0.001
Cognitively impaired + /sleepy–	–14.4	–36.6 to 7.8	–3.8	0.202
Cognitively impaired–/sleepy–	(ref)
NYHA functional class				0.001
Class I–II	(ref)
Class III	–11.9	–21.3 to –2.5	–3.4	0.017
Class IV	–27.5	–41.8 to –13.3	–4.9	<0.001

Model adjusted for age, race, income, gender, data collection occasion, depressive symptoms, perceived health, visit, and data collection site.

Square-transformed Functional Outcomes of Sleep Questionnaire was modelled.

CI, confidence interval; NYHA, New York Heart Association.