Table 7.

Covariance matrix for non-intubated patients.

Σ0	BFM	SpO2M	SpO2min	SpO2-90
BFM	20.3	−2.9	−4.3	0.10
SpO2M	−2.9	3.4	4.3	−0.08
SpO2min	−4.3	4.3	7.9	−0.14
SpO2-90	0.10	−0.08	−0.14	0.004