The impact of semi-upright position on severity of sleep disordered breathing in patients with obstructive sleep apnea: a two-arm, prospective, randomized controlled trial

Table 2 Postoperative sleep-related outcomes in both groups

Variable	Control (n = 14)			Intervention (n = 21)			Between group comparison (ANCOVA)
Variable	Pre-op	Post-op	p-value	Pre-op	Post-op	p-value	p-value
AHI	18.1 ± 13.3	28.4 ± 28.1	0.33	21.4 ± 13.1	20.8 ± 23.8	0.36	0.15
OAI	6.0 ± 3.6	16.6 ± 19.0	0.09	11.7 ± 9.2	8.6 ± 11.2	0.13	0.01^*
CAI	3.7 ± 9.5	3.6 ± 4.9	0.35	0.7 ± 1.4	1.3 ± 3.5	0.79	0.11
HI	8.6 ± 5.2	8.6 ± 8.4	0.9	9.0 ± 7.3	11.3 ± 11.4	0.34	0.49
OAHI	14.6 ± 7.2	25.2 ± 24.2	0.14	20.7 ± 12.6	19.8 ± 21.5	0.54	0.09
ODI	19.3 ± 12.5	26.2 ± 24.7	0.39	23.1 ± 14.3	26.1 ± 27.1	0.66	0.55
CT90	1.3 ± 2.0	28.1 ± 35.4	0.003*	4.4 ± 4.9	15.7 ± 19.8	0.04^*	0.11
Average SaO2	93.4 ± 1.3	90.0 ± 3.6	0.01*	93.1 ± 2.4	90.3 ± 3.8	0.002^*	0.40
Lowest SaO2	83.2 ± 5.0	75.0 ± 21.2	0.26	79.0 ± 6.1	77.8 ± 9.9	0.79	0.91
Supine %	44.5 ± 30.3	86.8 ± 20.4	< 0.001	43.0 ± 35.6	66.2 ± 42.4	0.06	0.40

AHI Apnea–Hypopnea Index, Apnea index average number of apnea episodes per hour, CAI Central Apnea Index: total number of central apneas per hour, CT90 cumulative percentage of total sleep time with oxygen desaturation below 90%, HI Hypopnea index, average number of hypopnea episodes per hour, OAHI Obstructive Apnea Hypopnea Index, total number of obstructive apneas and hypopneas per hour, OAI Obstructive Apnea Index: total number of obstructive apneas divided sleep time, ODI Oxygen Desaturation Index, number of events with oxygen desaturation below 4% threshold in one hour, SaO₂ saturation of oxygen in hemoglobin. Statistically significant P values are indicated with an asterisk (*)

ISSN: 1471-2253