94 Chapter 5 Table 1. Analysis of recordings n=92 one-per-second one-per-minute Average SpO2 mean (SD) 94.96 (1.88) 94.96 (1.87) Standard deviation SpO2 mean (SD) 3.14 (0.92) 3.15 (0.91) Percentage SpO2 in target range† median [IQR] 70.96 [57.16 - 91.50] 71.06 [57.00 - 91.53] Percentage SpO2 <80% median [IQR] 0.36 [0.09 - 0.85] 0.35 [0.10 - 0.85] Average FiO2 median [IQR] 22.65 [21.67 - 24.56] 22.70 [21.69 - 24.59] Days of supplemental oxygen median [IQR] 0 [0-2] 0 [0-2] Percentage missing SpO2 median [IQR] 2.06 [1.59 - 2.91] 2.06 [1.52 - 2.87] Number of data points median [IQR] 1151774 [577843 - 2586608] 19462 [9129 - 43162] Duration hours:min:sec median [IQR] 375:24:46 [157:59:33 - 762:23:11] 367:58:30 [155:11:45 - 757:12:00] FiO2, fraction of inspired oxygen; SpO2, peripheral oxygen saturation. † 91% <= SpO2 <= 95% or SpO2 >= 96% while FiO2 = 0.21 The per-patient average inspired FiO2 was 22.65 [21.67 - 24.56] vs. 22.70 [21.69 - 24.59], and there was no difference in oxygen days (0 [0 – 2] in both datasets). Sub analyses of groups with only less than 100 hours (table 2), 200 hours and half of the total dataset showed similar results with little difference between one-per-second and one-per-minute data.

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