Auto-CPAP | Constant CPAP | Mean difference | 95% CI for differences | p value | |
---|---|---|---|---|---|
AI | 2.9 (4.8) | 1.5 (2.7) | 1.4 | −0.8 to 3.5 | NS |
(0.0–15.0) | (0.0–10.00) | ||||
AHI | 4.2 (5.1) | 3.6 (4.0) | 0.6 | −1.4 to 2.7 | NS |
(0.0–18.0) | (0.0–13.0) | ||||
ODI | 2.5 (5.3) | 3.1 (4.3) | −0.6 | −2.1 to 0.9 | NS |
(0.0–22.0) | (0.0–16.0) | ||||
Mean CPAP pressure | 8.1 (2.9) | 7.6 (2.7) | 0.5 | 0.1 to 0.9 | 0.03 |
(4.0–14.0) | (4.1–14.7) | ||||
TST (min) | 336.3 (42.0) | 318.0 (41.5) | 18.3 | −5.7 to 42.3 | NS |
(279–405) | (253–429) | ||||
Sleeping in supine position (%TST) | 69.2 (16.7) | 71.2 (15.8) | −2.0 | −15.1 to 11.1 | NS |
(46.3–94.6) | (40.7–97.2) | ||||
Stages 1 + 2 (%TST) | 61.2 (14.9) | 62.6 (15.7) | −1.4 | −13.0 to 10.2 | NS |
(26.0–88.8) | (27.9–92.0) | ||||
Stages 3 + 4 (%TST) | 20.7 (11.9) | 16.8 (7.1) | 3.9 | −2.9 to 10.7 | NS |
(6.9–52.1) | (0.0–32.6) | ||||
REM (%TST) | 18.1 (5.5) | 17.0 (8.3) | 1.1 | −2.9 to 5.0 | NS |
(4.3–26.6) | (4.6–34.1) | ||||
Arousal index | 7.4 (4.1) | 7.0 (4.3) | 0.4 | −1.7 to 2.5 | NS |
(2.0–14.7) | (1.0–17.2) | ||||
ESS | 5.3 (3.9) | 6.5 (4.3) | −1.2 | −2.9 to 0.5 | NS |
(0.0–12.0) | (0.0–15.0) | ||||
VT: correct responses (%) | 94.0 (9.7) | 93.8 (9.2) | 0.2 | −1.8 to 2.2 | NS |
(61.0–100.0) | (67.0–100.0) | ||||
VT: false responses (%) | 5.25 (9.8) | 6.1 (10.3) | −0.8 | −3.8 to 2.2 | NS |
(0.0–40.0) | (0.0–38.0) | ||||
VT: mean response time (s) | 0.54 (0.09) | 0.55 (0.11) | −0.01 | −0.04 to 0.01 | NS |
(0.41–0.68) | (0.38–0.75) |
Values are mean (SD) with ranges.
95% CI = 95% confidence interval; AI = apnoea index (number of apnoeas per hour); AHI = apnoea/hypopnoea index (number of apnoeas and hypopnoeas per hour); ODI = oxygen desaturation index (number of desaturations ⩾4%); TST = total sleep time; %TST = percentage of total sleep time; ESS = Epworth Sleepiness scale; VT = vigilance test.