WatchPAT™200 System
71
Operation Manual
APPENDIX G: SPO
2
ACCURACY IN THE WP200
The WatchPAT™200 device uses Nonin module for SPO
2
measurement.
Nonin module measurement wavelengths and output power parameters:
Red: 660 nanometers @ 0.8 mW maximum average
Infrared (using NONIN PureLight® Sensor): 910 nanometers @ 1.2 mW maximum
average.
This appendix includes information regarding the accuracy of these measurements,
according to module manufacturer information (*).
1.
Overall, the ARMS is estimated to be 1.85 across the range of 70 to 100 percent
saturation, and with 95% confidence ranges from 1.59 to 2.3.
2.
The next table shows A
RMS
values measured using the Nonin module:
Range of SpO
2
A
RMS
95% confidence level
70
‐
80%
2.79
(2.296, 3.450)
80
‐
90%
1.23
(1.034, 1.470)
90
‐
100%
1.33
(1.021, 1.567)
3.
The next figure shows the A Bland
‐
Altman plot of the Bias (SpO
2
–SaO
2
) versus
the Mean (½SaO
2
+½SpO
2
).
Solid gray lines represent the mean bias. Dashed gray lines represent the 95% limits
of agreement.
