Study population with the mean difference in pulse oximetry and ABG oxygen saturations in a 30 min window for paired samples
| Paired samples (n) | Unique patients (n) | Mean O2 saturation difference (pulse oximetry−ABG) (%) | SD | |
| Overall | 5927 | 3420 | 3.0 | 13 |
| Age (years) | ||||
| <60 | 1819 | 1015 | 3.3 | 13 |
| 60–80 | 2915 | 1579 | 2.7 | 13 |
| >80 | 1193 | 826 | 3.1 | 14 |
| Male | 3334 | 1929 | 3.1 | 13 |
| Female | 2593 | 1491 | 2.8 | 13 |
| BMI | ||||
| Missing | 172 | 128 | 8.6 | 18 |
| <21 | 758 | 388 | 3.0 | 14 |
| 21–30 | 3003 | 1808 | 3.2 | 13 |
| >30 | 1994 | 1096 | 2.3 | 12 |
| Smoking | ||||
| Not reported | 4603 | 2735 | 2.7 | 13 |
| Current smoker | 1324 | 685 | 3.9 | 14 |
| Ethnicity | ||||
| Asian | 269 | 153 | 5.3 | 16 |
| Black | 200 | 124 | 5.2 | 15 |
| Other | 132 | 73 | 4.2 | 12 |
| White | 4330 | 2487 | 2.7 | 13 |
| Not recorded | 996 | 583 | 2.9 | 12 |
| Paired samples (n) | Unique patients (n) | Mean measurement after extremes excluded | SD | |
| Systolic BP (mm Hg) | 5546 | 3260 | 127 | 22 |
| Diastolic BP (mm Hg) | 5590 | 3278 | 71 | 13 |
| HR (beats per minute) | 5202 | 3128 | 91 | 16 |
BMI, body mass index.