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Table 2 Sleep architecture (n = 480)

From: Parasomnias and sleep disordered breathing in Caucasian and Hispanic children – the Tucson children's assessment of sleep apnea study

  Mean SD
Sleep Time 487 minutes 79.7 minutes
Sleep Efficiency 89.8% 5.8%
Stage 1 (%) 4.6% 3.3%
Stage 2 (%) 52.0% 6.1%
Stage 3/4 (%) 21.9% 6.1%
REM (%) 21.5% 5.0%
Sleep Latency 18.5 minutes 21 minutes
REM Latency 130.9 minutes 50.8 minutes