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Table 1 Comparison of HRV in hyperthyroidism patients and their matched controls during 2 h at rest

From: Heart rate variability in hyperthyroidism on sub Saharan African patients: a case–control study

Variables

Hyperthyroidism patients

Controls

p (Mann–Whitney)

Mean RR (s)

0.8 ± 0.1

0.9 ± 0.11

0.006

Mean HR (1/min)

82.9 ± 11

67 ± 6.80

0.006

RMSSD (ms)

30.4 ± 24.8

64 ± 56.82

0.09

SDNN index

39.5 ± 19.5

63.7 ± 35.83

0.20

LF (n.u.)

43.9 ± 29.5

38.8 ± 12.85

0.84

HF (n.u.)

32.5 ± 20.6

43.3 ± 17.34

0.38

LF/HF

3.7 ± 5.35

1.05 ± 0.54

0.46

  1. RR R to R interval, HR heart rate, RMSSD root-mean-square of successive differences, SDNN standard deviation of all normal R to R interval, LF low frequency, HF high frequency