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Table 4 Multivariate logistic regression analyses: heart rate variability indices (independent variables) categorized by tertiles and their respective odds ratios for the presence of peripheral arterial disease (dependent variable)

From: Cardiovascular autonomic neuropathy in type 2 diabetes mellitus patients with peripheral artery disease

  Odd ratio* 95%CI P
Time domain indices
SDNN day
1st tertile 6.08 1.24 - 29.90 0.026
2nd tertile 0.80 0.20 - 3.90 0.784
3rd tertile 1.0 - -
SDNNi night
1st tertile 7.67 1.60 - 37.30 0.012
2nd tertile 1.14 0.20 - 6.20 0.878
3rd tertile 1.00 - -
Frequency domain indices
High Frequency
1st tertile 7.37 1.50 - 37.30 0.016
2nd tertile 5.16 0.90 - 30.00 0.068
3rd tertile 1.00 - -
Low Frequency
1st tertile 6.17 1.10 - 35.10 0.040
2nd tertile 4.00 0.70 - 24.40 0.129
3rd tertile 1.00 - -
High Frequency / Low Frequency Ratio
1st tertile 7.42 1.50 - 37.10 0.015
2nd tertile 2.01 0.40 - 11.30 0.392
3rd tertile 1,00 - -
Tridimensional return map
P 1 night
1st tertile 2.67 0.60 - 11.80 0.195
2nd tertile 0.73 0.10 – 4.10 0.720
3rd tertile 1.00 - -
P 2 day
1st tertile 8.42 1.50 - 47.50 0.016
2nd tertile 2.59 0.40 - 15.90 0.305
3rd tertile 1.00 - -
  1. * the odds ratio was adjusted for diabetes duration, HbA1C, hypertension, serum triglycerides, and urinary albumin excretion in each model. SDNN= SD of the R-R intervals; SDNNi = mean of the SD of R-R intervals calculated in 5-min segment; P1 = index reflecting sympathetic modulation; P2 = index reflecting vagal modulation; upper index tertile (3rd) for each index was considered as the reference (OR = 1).