95 5 Comparing statistics from one-per-minute and one-per-second data Table 2. Sub analysis of shorter recordings Recordings <100 hours (n=11) one-per-second one-per-minute Average SpO2 mean (SD) 96.74 (1.74) 96.74 (1.67) Standard deviation SpO2 mean (SD) 3.07 (1.04) 3.17 (1.08) Percentage SpO2 in target range† median [IQR] 93.58 [52.76 - 98.80] 93.87 [55.43 - 98.85] Percentage SpO2 <80% median [IQR] 0.60 [0.08 - 0.81] 0.75 [0.14 - 0.96] Average FiO2 median [IQR] 21.05 [21.00 - 22.03] 21.05 [21.00 - 22.13] Days of supplemental oxygen median [IQR] 0 [0-2] 0 [0-2] Percentage missing SpO2 median [IQR] 2.85 [1.43 - 5.16] 3.04 [1.41 - 5.14] Number of data points median [IQR] 161742 [82864 - 188130] 2699 [1381 - 3364] Duration hours:min:sec median [IQR] 51:18:47 [32:40:20 - 51:17:00] 51:17:00 [24:13:00 - 62:04:00] Recordings <200 hours (n=28) one-per-second one-per-minute Average SpO2 mean (SD) 95.43 (2.06) 95.43 (2.04) Standard deviation SpO2 mean (SD) 3.00 (1.01) 3.03 (1.04) Percentage SpO2 in target range† median [IQR] 90.21 [60.06 - 96.47] 90.49 [59.62 - 94.69] Percentage SpO2 <80% median [IQR] 0.32 [0.07 - 0.92] 0.30 [0.07 - 1.01] Average FiO2 median [IQR] 21.99 [21.01 - 25.40] 21.95 [21.01 - 25.44] Days of supplemental oxygen median [IQR] 0 [0-3] 0 [0-3] Percentage missing SpO2 median [IQR] 2.58 [1.65 - 3.45] 2.58 [1.48 - 3.28] Number of data points median [IQR] 507425 [175763 - 542365] 8458 [3027 - 9041] Duration hours:min:sec median [IQR] 149:49:41 [55:26:45 - 154:20:26] 149:48:30 [55:25:45 - 154:20:00] FiO2, fraction of inspired oxygen; SpO2, peripheral oxygen saturation. † 91% <= SpO2 <= 95% or SpO2 >= 96% while FiO2 = 0.21
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