Sleep Environment and Insomnia in Elderly Persons Living at Home

Table 2

Odds ratio and confidence intervals for the predictive variables for the presence or absence of insomnia.

Variables	Insomnia vs. absence of insomnia^a
	OR	CI 95 %
Age	1.03	0.99–1.07
Sex
Male	1.44	0.94–2.21
Female	1.00
Body mass index (BMI)	1.00	0.96–1.05
Civil status
Living along	1.06	0.62–1.81
Living as a couple	1.00
Highest education level
Zero to 12 years	0.78	0.53–1.15
College to university degree	1.00
Partner sleeps in the same bed or bedroom
Sleeps alone in the bedroom	1.01	0.57–1.81
Partner sleeps in the same bedroom	1.00
Pillow comfort
Very uncomfortable to moderately comfortable	2.00	1.27–3.17
Very comfortable	1.00
Mattress comfort
Very uncomfortable to moderately comfortable	0.97	0.61–1.53
Very comfortable	1.00
Nocturnal bedroom noise
Very loud to not very loud	2.20	1.26–3.82
Completely quiet	1.00
Morning bedroom noise
Very loud to not very loud	0.70	0.41–1.18
Completely quiet	1.00
Bedroom brightness at night
Very bright to moderately bright	0.88	0.48–1.62
Moderately dark to very dark	1.00
Bedroom brightness in the morning
Very bright to moderately bright	0.95	0.64–1.42
Moderately dark to very dark	1.00

^aReference group. OR, odds ratio; CI, confidence interval. . Model χ²₍₁₂₎ = 28.70, .  =  0.055 (Cox and Snell), 0.074 (Nagelkerke).