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. 2015 Aug 17;10:1651–1661. doi: 10.2147/COPD.S81736

Figure 3.

Figure 3

Correlation between heart rate variability indices (absolute values) and variables from lung function tests.

Note: *P<0.05.

Abbreviations: LF/HF, low frequency/high frequency ratio; HF (nu), high frequency in normalized units; TGV, total gas volume; RV, residual volume.