Table 1 Polysomnograph results in a patient with Prader-Willi syndrome and narcoleptic and cataplectic symptoms ¹

Sleep architecture

Total sleep time (min)

420.5

489.5

516.5

520

492

Sleep efficiency (%)

84.9

90.8

92.7

94.4

95.1

Sleep stages total sleep time

Stage 1 (%)

6.5

2.2

2.5

0.6

2.1

Stage 2 (%)

43.4

48.1

57.9

64.7

59.3

Stage 3 and 4 (%)

22.5

25.8

18.6

18

18.5

REM (%)

27.6

23.9

21.0

16.8

20.1

Apnea events

Central apnea index (events per hour)

0.57

0

0.46

2.08

2.32

Obstructive apnea index (events per hour)

0.14

0.12

0

0.12

0

Number of mixed events per hour

0.43

0

0.58

0

0

Hypopnea events (events per hour)

0.29

0.25

0.23

0.34

3.05

Apnea-hypopnea index (events per hour)

1.4

0.4

1.3

2.7

5.6

End-tidal carbon dioxide (ETCO₂)

Mean total recorded ETCO₂ (mmHg)

44.5

46

42

43

45

Maximum total recorded ETCO₂ (mmHg)

60.9

60

51

50

54

Oxygen saturation (SaO₂)

Mean total recorded SaO₂ (%)

94.1

95

97

94

96

Minimum total recorded SaO₂ (%)

78.7

87

88

84

84

Anthropometrics

Height (cm)

84

97

104

110

116

Weight (kg)

11.25

15.2

17.4

20.0

21.4

BMI- z score

0.12

0.66

0.39

0.25

−0.23