Table 1.

Summary of optical absorption and scattering properties at baseline, end-of-asphyxia and 10-min of CPR.

	Baseline n = 48	Asphyxia, End (Δ Baseline)	p value†	CPR, 10 min (Δ Baseline)
				ROSC n = 37	No-ROSC n = 11	p value‡
Optical absorption coefficient µa (λ), (1/cm)
µa (690 nm)	0.16 [0.14, 0.19]	+ 0.07 [0.05, 0.09]	< 0.001	+ 0.05 [0.03, 0.06]	+ 0.03 [0.02, 0.05]	0.294
µa (725 nm)	0.14 [0.12, 0.15]	+ 0.04 [0.03, 0.05]	< 0.001	+ 0.03 [0.02, 0.04]	+ 0.02 [0.00, 0.03]	0.105
µa (785 nm)	0.14 [0.13, 0.15]	+ 0.02 [0.01, 0.03]	< 0.001	+ 0.01 [0.01, 0.02]	− 0.02 [− 0.02, 0.00]	0.011
µa (830 nm)	0.15 [0.13, 0.16]	+ 0.00 [− 0.01, 0.00]	0.061	+ 0.00 [− 0.00, 0.01]	− 0.01 [− 0.04, − 0.00]	0.001
Optical reduced scattering coefficient µs′ (λ), (1/cm)
µs′ (690 nm)	10.9 [9.9, 11.8]	+ 0.0 [− 0.4, 0.4]	0.759	− 0.0 [− 0.6, 0.4]	+ 0.3 [− 0.4, 0.6]	0.233
µs′ (725 nm)	10.2 [9.2, 10.9]	+ 0.1 [− 0.2, 0.2]	0.320	− 0.2 [− 0.5, 0.4]	+ 0.1 [− 0.2, 0.4]	0.204
µs′ (785 nm)	9.3 [8.3, 10.2]	+ 0.1 [− 0.1, 0.5]	0.024	− 0.1 [− 0.4, 0.1]	+ 0.5 [0.3, 0.9]	0.005
µs′ (830 nm)	8.7 [7.9, 9.4]	+ 0.0 [− 0.1, 0.2]	0.339	− 0.2 [− 0.5, 0.2]	+ 0.1 [0.0, 0.4]	0.077
Mie scattering model fit parameters, µs′(λ) = a*(λ/500 nm)^b
a, (1/cm)	15.4 [12.1, 18.8]	+ 0.2 [− 1.3, 1.5]	0.604	− 0.44 [− 1.89, 1.47]	+ 0.59 [− 1.23, 1.63]	0.691
b	1.1 [0.7, 1.6]	+ 0.0 [− 0.2, 0.2]	0.837	+ 0.04 [− 0.24, 0.30]	− 0.02 [− 0.20, 0.16]	0.691
Goodness-of-fit (adjusted R2)	0.82 [0.54, 0.94]	− 0.02 [− 0.10, 0.05]	0.142	− 0.03 [− 0.22, 0.05]	+ 0.08 [0.01, 0.17]	0.026

Values summarized as median [IQR].

^†p value from Wilcoxon signed-rank test.

^‡p value from Wilcoxon rank-sum test comparing ROSC and No-ROSC groups.

λ, wavelength; Δ Baseline, change from Baseline; ROSC, return of spontaneous circulation; a, fitted reduced scattering coefficient at λ = 500 nm; b, scattering power.