Table 3.

Rate Ratio of Hospitalization Days by Category of Sleep Disturbance Among Women With Atleast One Hospitalization and Mean Inpatient Hospital Days by Category of Sleep Disturbance among All Women.

	Rate ratio (95% CI)a of hospitalization days among women with at least one hospitalization		Mean (95% CI) rate of inpatient days per year among all women
Sleep/Wake disturbance	Age and site adjusted	Multivariable adjustedb	Age and site adjusted	Multivariable adjustedb
SE
<70%	1.05 (0.86–1.26)	0.96 (0.76–1.19)	2.90 (2.37–3.51)	2.21 (1.65–2.83)
≥70%	1.00 (referent)	1.00 (referent)	2.00 (1.84–2.17)	1.88 (1.72–2.05)
SL
>60 min	1.15 (0.98–1.33)	1.10 (0.93–1.29)	2.60 (2.17–3.05)	2.11 (1.74–2.53)
≤60 min	1.00 (referent)	1.00 (referent)	1.96 (1.79–2.13)	1.87 (1.69–2.05)
WASO
≥90 min	1.20 (1.04–1.37)**	1.03 (0.90–1.18)	2.69 (2.34–3.03)	2.03 (1.74–2.33)
<90 min	1.00 (referent)	1.00 (referent)	1.83 (1.66–2.01)	1.86 (1.68–2.06)
TST
≤5.0 h	1.09 (0.90–1.30)	1.11 (0.89–1.38)	2.76 (2.25–3.33)	2.46 (1.92–3.06)
5–8 h	1.00 (referent)	1.00 (referent)	1.93 (1.76–2.10)	1.80 (1.64–1.97)
>8 h	1.19 (0.99–1.41)	1.18 (0.96–1.44)	2.48 (2.03–2.98)	2.19 (1.69–2.80)
PSQI
>8	1.18 (1.02–1.35)**	1.12 (0.95–1.29)	2.57 (2.20–2.97)	2.06 (1.69–2.42)
≤8	1.00 (referent)	1.00 (referent)	1.92 (1.76–2.10)	1.86 (1.68–2.03)
ESS
>10	1.20 (0.96–1.46)	1.10 (0.87–1.32)	2.56 (2.00–3.15)	2.02 (1.56–2.50)
≤10	1.00 (referent)	1.00 (referent)	2.02 (1.86–2.19)	1.90 (1.73–2.07)

ESS = Epworth Sleepiness Scale; PSQI = Pittsburgh Sleep Quality Index; SE = sleep efficiency; SL = sleep latency; TST = total sleep time; WASO = Wake after sleep onset.

^aBootstrapping with 1000 samples used to estimate 95% confidence intervals and p-values.

^bAdjusted for age, clinic site, race, depression, use of antidepressants, cognitive functioning, 6 meter walking speed, self-reported health status, any impairments in instrumental activities of daily living, number of comorbidities, probable dementia, and living independently.

**p < .05