artifact_f1t3 reviewerid_f1t3
Name
avgspo2baseline_f1t3
Label
Average oxygen saturation before sleep onset
Description

The EDF and XML annotation files from the nuMoM2b sleep substudy were imported in Matlab for analysis of baseline SpO2 (oxygen saturation). First step involved identification of the initial sleep onset (stage=2). Sixty seconds of wake data preceding the initial sleep onset was identified as the baseline segment for calculation of average SpO2. If 60s of wake data was not present, 30s was used as the baseline segment. Average value of SpO2 signal was calculated at this baseline segment. If there was no usable SpO2 signal or baseline wake data before sleep onset, then baseline SpO2 is missing. A few subjects had less than 90% SpO2 at baseline either due to signal distortion/artifacts or baseline desaturation events and were marked as missing.

Type
numeric
A4b. Visit of Sleep Study vs Average oxygen saturation before sleep onset
N Mean StdDev Median Min Max Unknown Total
Visit 1 2,928 96.2 ± 1.2 96.4 90.1 99.0 84 3,012
Visit 3 2,281 95.6 ± 1.3 95.8 90.6 99.0 51 2,332
Race/ethnicity combined categories derived from V1AF05 and V1AF07a-g vs Average oxygen saturation before sleep onset
Visit 1
N Mean StdDev Median Min Max Unknown Total
Total 2,928 96.2 ± 1.2 96.4 90.1 99.0 84 3,012
Non-Hispanic White 1,809 96.0 ± 1.2 96.1 90.1 99.0 33 1,842
Non-Hispanic Black 349 96.7 ± 1.0 96.9 91.9 99.0 10 359
Hispanic 526 96.6 ± 1.0 96.9 91.0 99.0 31 557
Asian 107 96.5 ± 1.0 96.9 93.7 98.2 5 112
Other 137 96.2 ± 1.3 96.5 90.4 99.0 5 142
Race/ethnicity combined categories derived from V1AF05 and V1AF07a-g vs Average oxygen saturation before sleep onset
Visit 3
N Mean StdDev Median Min Max Unknown Total
Total 2,281 95.6 ± 1.3 95.8 90.6 99.0 51 2,332
Non-Hispanic White 1,465 95.4 ± 1.3 95.4 90.6 99.0 29 1,494
Non-Hispanic Black 243 96.2 ± 1.1 96.4 92.4 99.0 4 247
Hispanic 384 96.1 ± 1.3 96.3 91.0 99.0 13 397
Asian 82 95.6 ± 1.3 95.7 92.9 98.2 2 84
Other 107 95.7 ± 1.2 95.8 92.4 98.8 3 110