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Effect of contact pressure on SpO2 error between optical fibre sensor and a commercial pulse oximeter. When the contact pressure is higher than 25 kPa, the SpO2 error is >10%. When the contact pressure is lower than 15 kPa, the SpO2 error is lower than 2%. The SpO2 error reached the lowest value while the contact pressure is in the range from 5 to 15 kPa.
