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Table 5 Comparison selected PSG indices with previous sleep studies in general children population (mean ± standard deviation)

From: Sleep problems among children with Fetal Alcohol Spectrum Disorders (FASD)- an explorative study

  Current study Montgomery- Downs [36] Montgomery-Downs [36] Goodwin [37]
Age, range, years 2.9–12.6 3.2–5.9 6.0–8.6 6–11
N 19 153 388 480
TST, min 464 ± 50.4 475.2 ± 42.0 471.6 ± 43.7 487 ± 79.7
Sleep efficiency, %TIB 84.8 ± 7.9 90.0 ± 7.0 89.3 ± 7.5 89.8 ± 5.8
Sleep latency, min 24.7 ± 25.7 24.1 ± 25.6 23.0 ± 25.3 18.5 ± 21.0
W, %TIB 15.2 ± 7.9 9.4 ± 7.3 8.1 ± 7.1  
N1, %TST 4.5 ± 2.5 6.6 ± 4.8 7.1 ± 5.5 4.6 ± 3.3
N2, %TST 52.5 ± 6.3 41.6 ± 7.1 46.1 ± 8.5 52.0 ± 6.1
N3, %TST 26.8 ± 6.2 S3: 6.6 ± 2.6
S4: 21.6 ± 6.2
S3: 5.5 ± 2.9
S4: 18.5 ± 6.6
21.9 ± 6.9
REM, %TST 16.2 ± 4.0 23.6 ± 4.8 22.2 ± 5.2 21.5 ± 5.0
Arousal index, events/h 7.4 ± 2.2 9.0 ± 3.4 9.5 ± 5.3  
Total apnea index, events/h 1.8 ± 1.8 0.86 ± 0.75 0.50 ± 0.52  
Central apnea index, events/h 1.6 ± 1.5 0.82 ± 0.73 0.45 ± 0.49 0.28 ± 0.84
Obstructive apnea index, events/h 0.2 ± 0.3 0.03 ± 0.1 0.05 ± 0.11 0.02 ± 0.27
Mixed apnea index, events/h 0.1 ± 0.2 0.01 ± 0.05 0.01 ± 0.06  
Hypopnea index, events/h 1.3 ± 3.0 0.03 ± 0.07 0.10 ± 0.18  
Apnea hypopnea index, events/h 3.2 ± 4.4 0.90 ± 0.78 0.68 ± 0.75 0.90 ± 1.91
Minimal SaO2, % 90.1 ± 3.1 92.7 ± 4.5 92.6 ± 3.6  
Average SaO2, % 96.4 ± 1.2