Table 2

Three mixed-effects linear models of the difference in oxygen saturations as measured by paired pulse oximetry and ABG and their association with systolic BP, diastolic BP and HR

Three univariate models (30 min window)Pulse oximetry−arterial O2 saturation difference
Patients (n)Observations (n)Estimates (95% CI)P value
Systolic BP (mm Hg)32605546−0.02 (−0.03 to −0.00)0.043
Diastolic BP (mm Hg)32785590−0.03 (−0.05 to −0.00)0.047
HR (beats per minute)31285202−0.04 (−0.06 to −0.02)<0.001
Three univariate models (10 min window for sensitivity analysis)
Observations (n) Estimates (95% CI) P value
Systolic BP (mm Hg)16292157−0.03 (−0.06 to −0.00)0.028
Diastolic BP (mm Hg)16522186−0.03 (−0.08 to 0.01)0.168
HR (beats per minute)15422015−0.04 (−0.07 to 0.00)0.058