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. Author manuscript; available in PMC: 2019 Aug 1.
Published in final edited form as: Sleep Med. 2018 May 21;48:172–179. doi: 10.1016/j.sleep.2018.05.005

Table 2.

Distribution of sleep variables based on RRD tercile categories.

Sleep parameters All RRD (msec) Tercile groups P value
Median [IQR] Shortest
75.2–112.2
Middle
112.2–125.0
Longest
125.0–189.5
AHI (/hr) 7.5 [2.8–17.5] 9.0 [3.2–24.3] 7.7 [2.8–16.4] 7.5 [2.7–15.8] 0.0002
O2 desaturation index (ODI) (/hr) 7.5 [2.8–17.5] 8.1 [2.9–23.2] 7.0 [2.6–16.0] 7.4 [2.5–15.3] 0.0005
Mean O2 saturation (Mean O2 Sat) (%) 94.8 [93.7–95.7] 94.9 [93.7–95.5] 94.8 [93.6–95.7] 94.7 [93.4–95.8] 0.6
PCT90% (%) 0.5 [0.03–2.7] 0.6 [0.05–3.2] 0.5 [0.03–2.8] 0.5 [0.03–2.1] 0.06

RRD, ECG R-wave to Radial Artery Pulse Delay (unit: msec); PCT90%, % time spent with O2 saturation (SpO2) less than 90%. P value is based on Kruskal-Wallis test.