Table 2.

Sleep Apnea Symptoms in Surgery and Control Groups

	Surgery	Control	P-value	OR (95% CI)
Number of subjects	1592	1431
Freq. apneas
Baseline, %	24.0	21.8	<0.001
Follow-up, %	8.3	20.8	<0.001
Incidence, %	2.3	6.7	<0.001	0.28 (0.16 to 0.49)
Persistence, %	27.9	71.3	<0.001	0.16 (0.10 to 0.23)
Freq. snoring
Baseline, %	44.5	35.6	<0.001
Follow-up, %	10.8	29.8	<0.001
Incidence, %	2.1	10.0	<0.001	0.18 (0.10 to 0.32)
Persistence, %	21.6	65.5	<0.001	0.14 (0.10 to 0.19)
Freq. daytime sleepiness
Baseline, %	25.8	20.4	<0.001
Follow-up, %	12.7	17.8	<0.001
Incidence, %	5.9	8.4	0.018	0.66 (0.45 to 0.96)
Persistence, %	32.6	54.6	<0.001	0.44 (0.30 to 0.63)

Incidence: proportion of subjects with symptoms at 2-year among those without reported symptoms at baseline

Persistence: proportion of subjects with symptoms at 2-year among those with reported symptoms at baseline

Proportions are unadjusted values. P-value: Fischer's exact test, unadjusted

OR (95% CI): odds-ratio (95% confidence interval), adjusted for age, sex, BMI, smoking, diabetes, alcohol, and neck circumference at baseline