
Sensitivity
(%)

Specificity
(%)

PPV
(%)

NPV
(%)


24hour
    

Mean NN ≤ 779 ms

73

55

62

67

SDNN ≤ 141 ms

68

68

68

68

SDANN ≤ 119 ms

64

68

67

65

SDSD ≤ 40 ms

64

68

67

65

RMSSD ≤ 40 ms

64

68

67

65

pNN50 ≤ 13%

55

73

67

62

Sleeping hours
    
Mean NN ≤ 922 ms

73

59

64

68

SDNN ≤ 114 ms

86

68

73

83

SDANN ≤ 59 ms

68

82

79

72

SDSD ≤ 44 ms

55

73

67

62

RMSSD ≤ 44 ms

55

73

67

62

pNN50 ≤ 31%

68

55

60

63

 Mean NN, mean NN interval; pNN50, percentage of adjacent pairs of RR intervals that differ by more than 50 ms from each other in a given time period; ms, milliseconds; RMSSD, square root of the mean of the squares of differences between adjacent NN intervals; SDANN, mean standard deviation of the average NN intervals calculated over 5 minutes; SDNN, standard deviation of the NN intervals; SDSD, standard deviation of the successive NN differences.