Table 4Clinical evidence summary: Educational interventions + CPAP versus usual care + CPAP- Severe OSAHS

OutcomesNo of Participants (studies) Follow upQuality of the evidence (GRADE)Relative effect (95 % CI)Anticipated absolute effects
Risk with ControlRisk difference with Educational interventions + CPAP versus usual care + CPAP (95% CI)

CPAP Device Usage (hours/night)

Higher is better

1128

(10 studies)

⊕⊝⊝⊝

VERY LOW1,2,3,4

due to risk of bias, inconsistency, imprecision, indirectness

The mean CPAP device usage (hours/night) in the control group was

3.5

The mean CPAP device usage (hours/night) in the intervention groups was

0.88 higher

(0.4 to 1.36 higher)

N deemed adherent (≥ four hours/night)

Higher is better

1019

(7 studies)

⊕⊕⊝⊝

VERY LOW1,3,4

due to risk of bias, imprecision, indirectness

RR 1.31 (1.15 to 1.48)Moderate
547 per 1000

170 more per 1000

(from 82 more to 263 more)

Withdrawal

1745

(9 studies)

⊕⊕⊝⊝

LOW1,4

due to risk of bias, indirectness

RR 0.73 (0.52 to 1.02)Moderate
150 per 1000

41 fewer per 1000

(from 72 fewer to 3 more)

Epworth Sleepiness Scale - Comparison of Values at Endpoint-

Scale from 0-24

Higher is worse

355

(3 studies)

⊕⊝⊝⊝

VERY LOW1,3,4

due to risk of bias, imprecision, indirectness

The mean ESS in the control group was 6.41

The mean epworth sleepiness scale scores in the intervention groups was

0.08 lower*

(0.92 lower to 0.76 higher)

Mortality (critical outcome)----Not reported
1

Downgraded by 1 increment if the majority of the evidence was at high risk of bias, and downgraded by 2 increments if the majority of the evidence was at very high risk of bias

2

Downgraded by 1 or 2 increments for heterogeneity, unexplained by subgroup analysis. Random effect analysis used.

3

Downgraded by one increment if the confidence interval crossed one MID and downgraded by two increments if the confidence interval crossed both MIDs. MID for machine usage (adherence)- 1 hour; Established MIDs for SF-36 physical/mental- 2/3 ; FOSQ- 2 ; ESS −2.5;SAQLI – 2. GRADE default MID (0.5XSD) used for all other continuous outcomes.

4

Downgraded by 1 or 2 increments because the majority of the evidence included an indirect or very indirect population respectively

*

Not sleepy in both groups

From: Adherence

Cover of Adherence
Adherence: Obstructive sleep apnoea/hypopnoea syndrome and obesity hypoventilation syndrome in over 16s: Evidence review N.
NICE Guideline, No. 202.
National Guideline Centre (UK).
Copyright © NICE 2021.

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