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Overall quality of signal from oximeter during sleep as assessed by scorer.

If RDI = 0, scorer has verified that this value is real.

Data was lost at the beginning of sleep period because recording began after sleep onset.

Data was lost at the end of sleep period because recording ended before wake.

Due to signal problems, scorer was unable to reliably assess arousals in stage REM. The scoring of arousals in stage REM was determined to be unreliable.

Scorer noted that there was a problem differentiating REM and non-REM sleep.

Due to signal problems, scorer noted that there was a problem scoring respiratory events.

Study was scored sleep/wake rathen than with full sleep staging. This assessment is made by the scorer if there is not sufficient quality on EEG leads to do full R&K scoring. (0=no (full scoring); 1=yes (sleep/wake only))

Scorer noted that there was a problem differentiating stage 1 and stage 2 sleep.

Scorer noted that there was a problem differentiating stage 2 and stage 3/4 sleep.

Scorer observed unusual sleep staging. This is noted when there is no sleep in any particular stage (eg. no REM).

Scorer noted that there was a problem differentiating stage wake from stage sleep.