Table 4– Clinical, anthropometric and polygraphic data for the sleep disordered breathing subjects at the first examination and follow-up according to severity

	RDI >15 to <30 events·h^−1#			RDI >30 events·h^−1¶
	Baseline	Follow-up	p-value⁺	Baseline	Follow-up	p-value⁺
BMI kg·m⁻²	25.4±3.8	25.6±3.9	ns	26.1±3.3	26.5±3.6	0.002
Neck circumference cm	37.2±3.8	36.9±3.7	0.02	39.0±3.8	38.4±3.9	0.006
Diurnal SBP mmHg	123.7±14.5	122.0±15.2	ns	126.3±13.2	122.5±13.4	0.005
Diurnal DBP mmHg	77.2±8.8	75.6±8.9	0.006	78.0±8.0	75.0±7.8	<0.001
Nocturnal SBP mmHg	107.8±13.7	106.5±12.0	ns	111.2±13.1	107.1±12.3	0.005
Nocturnal DBP mmHg	66.3±8.3	65.2±9.0	ns	68.3±8.4	65.2±8.2	0.005
ESS score	6.2±3.7	6.0±4.3	ns	5.9±3.3	6.4±3.4	0.006
Subjective sleep time min	469.2±70.6	463.6±91.0	ns	459.3±76.0	450.1±99.2	ns
Total AAI events·h⁻¹	35.1±14.5	41.4±27.2	0.001	45.4±15.2	48.5±26.1	ns
Nonrespiratory AAI events·h⁻¹	21.1±11.3	28.0±23.0	<0.001	19.4±10.0	27.4±20.7	<0.001
Respiratory AAI events·h⁻¹	14.0±6.1	13.6±8.6	ns	26.0±10.4	21.1±12.1	<0.001
RDI events·h⁻¹	21.3±4.6	16.1±10.8	<0.001	44.5±13.8	28.0±14.4	<0.001
ODI events·h⁻¹	8.2±5.6	9.3±8.2	0.02	16.3±10.4	17.1±10.9	ns
Mean S_p,O₂ %	95.2±1.7	95.2±1.7	ns	95.3±1.4	95.1±1.5	ns
Time S_p,O₂ <90% %	1.97±8.1	2.06±5.9	ns	2.0±3.4	2.8±5.1	ns
Minimal S_p,O₂ %	89.4±3.9	88.9±4.9	ns	88.3±4.0	88.1±4.6	ns

Data are presented as mean±sd. RDI: respiratory disturbance index; BMI: body mass index; SBP: systolic blood pressure; DBP: diastolic blood pressure; ESS: Epworth Sleepiness Scale; AAI: autonomic arousal index; ODI: oxygen desaturation index; S_p,O₂: arterial oxygen saturation measured by pulse oximetry; ns: nonsignificant. ^#: n=185; ^¶: n=132; ⁺: paired t-test.