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. 2021 Sep 17;21(18):6233. doi: 10.3390/s21186233

Table 2.

The statistics of respiratory-related Poincare-plot equivalent characteristics described by SD1, short-term variability, SD2, long-term variability, and their ratio, for analyses performed for respiratory rate and VENT parameter cases; BPM stands for breaths per minute.

Case SD1 SD2 Avg. SD1/SD2
Respiratory rate case [BPM] 1.47 ± 0.06 8.17 ± 1.04 0.182
VENT parameter case [a.u.] 4.51 ± 0.65 34.42 ± 3.67 0.134