Table 1.

Characteristics of sleep apnoea in patients*

Variable	n (%)	95% CI
AHI ≥5	n=120
AHI ≥15	65 (54.2)	45.3 to 62.8
AHI ≥30	37 (30.8)	23.3 to 39.6
CAI ≥5	33 (27.5)	20.3 to 36.1
CAI ≥15	18 (15)	9.7 to 22.5
CAI ≥30	12 (10)	5.8 to 16.7
Obstructive sleep apnoea	86 (72)	63 to 79
Central sleep apnoea	24 (20)	13.8 to 28
Sleep apnoea: indeterminate type	10 (8)	4.6 to 14.7

*All variables are expressed as events per hour. Participants were stratified to have obstructive sleep apnoea if greater than or equal to 50% of events were obstructive in nature, and were stratified to have central sleep apnoea if greater than or equal to 50% of events were central in nature.¹⁵ Participants were stratified to have indeterminate sleep apnoea if they have AHI >5, but both the OAHI and CAHI were <5.

AHI, Apnoea-Hypopnoea Index; CAI, Central Apnoea Index.