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Table 5 Studies reporting AHI but not applicable for meta-analysis

From: Is the supine position associated with loss of airway patency in unconscious trauma patients? A systematic review and meta-analysis

Study Patients Study details Results Favors lateral Notes
(Year, country)
Children with obstructive sleep apnea (OSA)    
Zhang [47] (2007) China 45 children (3–13 years) with OSA Observational study of AHI in lateral vs. supine sleeping positions, measured by PSG. AHI (events/h), median: + Reports IQR, not SD.
0 in left and right lateral position, 11.9 in supine- P < 0.001 and p = 0.003, respectively.
do Prado [45] (2002) USA 80 children (1–10 years) with suspected OSA Observational study of obstructive AHI in lateral vs. supine sleeping positions, measured by PSG. Obstructive AHI (events/h), mean: ? Does not report SD.
7 in lateral positions, 8 in supine- No significant difference.
Nisbet [50] (2014) Australia 76 children with Down syndrome (DS), 76 without DS Observational study of AHI in DS, with matched controls. AHI (events/h), median:   We report data from control group, as DS may be too indirect.
REM sleep: 8.3 in non-supine positions, 17.8 in supine position +
Reports IQR, not SD.
Non-REM: 4.6 in non-supine positions, 5 in supine position. ?
In Non-REM sleep the difference is not clinically important.
Adults with OSA    
Kim [48] (2011) Korea 75 adults with OSA Conference abstract of observational study of AHI in supine sleeping position vs. all other positions. “This study confirms … that OSAS is position dependent in more than 50% of patients and non-supine position would lower the AHI…” + No data given, should be interpreted with caution.
Sasai [34] (2011) Japan 30 adults with moderate and severe OSA Observational study of obstructive AHI in supine vs. all sleeping positions, measured by PSG. AHI (events/h), mean: ? Does not report AHI in lateral position per se.
Moderate OSA: 27.0 in all positions, 27.5 in supine position.
In the severe group: p < 0.05, but not regarded as clinically significant difference.
Severe OSA: 77.1 in all positions, 79.9 in supine position.
Li [46] (2006) China 54 adults with OSA Observational study of AHI in in lateral vs. supine sleeping positions, measured by PSG. “…the overall AHI in supine position was higher than in lateral…” + Article in Chinese, only abstract in English, no data.
p = 0.000
Adults with stroke    
Svatikova [49] (2011) USA 18 adults with stroke Randomized crossover study of positional therapy for sleep apnea in stroke. AHI (events/h), mean (no intervention): + Reports IQR, not SD.
No p-value given.
27 in non-supine positions, 49 in supine position.