Table 5. Difference of the feature values between the drowsy and alert states (region C, 5 sec window).

Feature	Region C (drowsy – alert)
	Ch. 21	Ch. 22	Ch. 23	Ch. 24	Ch. 25	Ch. 26	Ch. 27	Ch. 28
M	−1.2E-03	−1.3E-03	−1.6E-03	−1.9E-03	−3.7E-04	−1.3E-03	−3.2E-04	−1.6E-03
P	−1.2E-03	−1.3E-03	−1.8E-03	−2.0E-03	−3.8E-04	−1.3E-03	−3.2E-04	−1.6E-03
SoP	0.0E + 00	9.5E-04	0.0E + 00	2.6E-04	0.0E + 00	0.0E + 00	0.0E + 00	0.0E + 00
NoP	0	8	0	13	0	0	0	0
M*	−6.2E-04	−9.5E-04	−7.2E-04	−6.6E-04	−3.6E-04	−6.7E-04	−1.9E-04	−7.4E-04
skew	8.1E-02	3.9E-03	−3.1E-03	−5.3E-02	6.4E-02	3.0E-02	7.0E-02	6.2E-02
kurt	−5.5E-02	−6.8E-02	5.8E-02	−1.9E-02	−5.4E-03	−2.5E-04	−9.4E-02	1.2E-02
SS	−1.1E-15	−2.7E-16	−7.4E-17	6.8E-19	3.0E-20	2.1E-20	1.0E-21	1.0E-21
f	0.0E + 00	−5.3E-05	0.0E + 00	−6.1E-04	0.0E + 00	0.0E + 00	0.0E + 00	0.0E + 00

Note: * indicates the mean value computed from ∆HbR.