TABLE 1.
Definitions of rapid eye movement (REM) obstructive sleep apnoea (OSA) in epidemiological studies
| Reference(s) | Definition of OSAREM |
| [32] | Quartiles of AHIREM, AHINREM ≥ or <8 events·h−1 |
| [33 ] | AHIREM ≥5 events·h−1, AHI <15 events·h−1 |
| [40] | No OSAREM: AHIREM <10 events·h−1; mild OSAREM: AHIREM 10–19 events·h−1; moderate OSAREM: AHIREM 20–29 events·h−1; severe OSAREM: AHIREM >30 events·h−1 |
| [35] | REM sleep ≥30 min; AHIREM categories (>5, 5.0–9.9, 10–19.9 and ≥20 events·h−1) |
| [41] | AHINREM <5 events·h−1; AHIREM: <5 (normal), 5.0–14.9 (mild), 15.0–29.9 (moderate) and ≥30.0 events·h−1 (severe) |
| [36, 39] | REM sleep ≥30 min; severe OSAREM: AHIREM >30 events·h−1 |
| [36] | REM sleep ≥30 min; severe OSAREM: AHIREM >30 events·h−1; total AHI <15 events·h−1 |
| [36] | REM sleep ≥30 min; severe OSAREM: AHIREM >30 events·h−1; total AHI <15 events·h−1 and AHINREM <5 events·h−1 |
| [38] | AHIREM >5 events·h−1; REM sleep ≥15 min |
| [43, 44] | Overall AHI between 10 and 25 events·h−1, AHIREM/AHINREM >2 and AHINREM <10 events·h−1 |
| [45] | Overall AHI ≥5 events·h−1, AHIREM/AHINREM >2, REM sleep ≥15% of TST |
| [55] | Overall AHI ≥5 events·h−1, AHIREM/AHINREM ≥2, REM sleep ≥10 min |
| [46, 51, 56] | Overall AHI ≥5 events·h−1, AHIREM/AHINREM ≥2, REM sleep ≥10 min, AHINREM <15 events·h−1 |
| [53, 57, 42, 58, 48] | Overall AHI ≥5 events·h−1, AHIREM/AHINREM ≥2, REM sleep >10.5 min, AHINREM <8 events·h−1 |
| [57, 42, 54, 58, 48, 52] | Overall AHI ≥5 events·h−1, AHIREM/AHINREM ≥2 |
| Predominant OSAREM [57, 42, 58, 47, 48, 50, 52] | Overall AHI ≥5 events·h−1, AHIREM/AHINREM ≥2, AHINREM <15 events·h−1 |
| Isolated OSAREM [34, 37, 54, 49] | Overall AHI ≥5 events·h−1, AHIREM/AHINREM ≥2, AHINREM <5 events·h−1, AHIREM >5 events·h−1, REM sleep ≥30 min |
| [49, 52] | Overall AHI ≥5 events·h−1, AHIREM/AHINREM ≥2, AHINREM <15 events·h−1, REM sleep ≥30 min |
AHI: apnoea–hypopnoea index; NREM: non-REM; TST: total sleep time.