. Author manuscript; available in PMC: 2013 May 1.

Published in final edited form as: Sleep Med. 2012 Mar 18;13(5):476–483. doi: 10.1016/j.sleep.2011.12.007

Table 2.

Cross-sectional association of disturbed sleep with COPD symptoms and severity among 98 COPD subjects

	OR (95% CI)	p-value
Cough Symptoms	3.3 (1.1 – 9.7)	0.034
Dyspnea Scale^*	1.4 (1.1 – 1.7)	0.004
COPD Severity Score^†	1.9 (1.1 – 3.2)	0.015
Oxygen Saturation ≤ 92%	2.2 (0.7 – 6.5)	0.18
FEV₁^‡	0.97 (0.4 – 2.2)	0.94

All analyses control for age, gender, race, marital status, education, and BMI. Each COPD symptom or severity measurement listed above was used as an independent variable in its own multivariable logistic regression analysis in which sleep disturbance was the outcome (dependent variable).

Dyspnea Scale OR presented per 1 point change in scale.

^†

OR per standard deviation change in COPD Severity Score (SD= 6.1).

^‡

Per liter increment in FEV₁