Daytime QT by Routine 12-Lead ECG Is Prolonged in Patients with Severe Obstructive Sleep Apnea

Table 3

Odds ratio of abnormal QTc based on comorbidity.

Initial analysis	Odds ratio	95% CI	value
Moderate vs. normal-mild OSA	0.78	0.36-1.67	0.19
Severe vs. normal-mild OSA	1.44	0.72-2.92	0.1
BMI (kg/m^2)	0.99	0.95-1.02	0.4
Age (years)	0.99	0.97-1.02	0.6
Hypertension	1.36	0.66-2.88	0.41
HF	4.07	2.1-8.06	<0.0001
Subsequent analysis (dichotomous groups)	Odds ratio	95% CI	value
Severe vs. nonsevere OSA	2.68	1.34-5.48	0.0058
BMI (kg/m^2)	0.96	0.92-1	0.05
Age (years)	0.99	0.96-1.02	0.62
Hypertension	1.42	0.59-3.67	0.45
HF	5.41	2.63-11.35	<0.0001

Classification of apnea-hypopnea index (AHI) in trichotomous stratification: normal-mild: <15/hr, moderate: 15-30/hr, and severe: >30/hr. For dichotomous stratification: nonsevere: <30/hr (i.e., normal-mild and moderate), severe: >30/hr. OSA = obstructive sleep apnea; BMI = body mass index; HF = heart failure; CI = confidence interval.