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. 2019 Dec 23;6(1):e000523. doi: 10.1136/bmjresp-2019-000523

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.