Table 4

Predictive value of heart rate variability indexes in 22 patients with fibromyalgia and 22 controls.

Sensitivity

(%)

Specificity

(%)

PPV

(%)

NPV

(%)


24-hour


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 R-R 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.

Lerma et al. Arthritis Research & Therapy 2011 13:R185   doi:10.1186/ar3513

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