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. Author manuscript; available in PMC: 2017 Feb 15.
Published in final edited form as: Brain Res. 2015 Nov 6;1633:126–138. doi: 10.1016/j.brainres.2015.10.053

Table 4.

Linear mixed effect model of mean COP velocitya with the following predictors: (1) group; (2) time period; (3) HbO2; (4) time × group; (5) time × HbO2; (6) HbO2 × group; and (7) HbO2 × time × groupb.

Parameter Estimate Std. error df t Sig. 95% confidence interval
Lower bound Upper bound
(1) PS vs. MPS −0.29 0.08 317.29 −3.87 <0.01 −0.44 −0.14
PS vs. control −0.39 0.08 297.47 −5.18 <0.01 −0.54 −0.24
(2) [Time period 1 vs. 2]c −0.46 0.08 161.88 −5.79 <0.01 −0.62 −0.31
(3) HbO2 −0.77 0.17 288.18 −4.48 <0.01 −1.11 −0.43
(4) [Time period 1 vs. 2]*[PS vs. MPS] 0.35 0.09 159.56 4.02 <0.01 0.18 0.53
[Time period 1 vs. 2]*[PS vs. control] 0.44 0.09 156.86 5.08 <0.01 0.27 0.61
(5) [Time period 1 vs. 2]*[HbO2] 1.62 0.19 309.81 8.48 <0.01 1.24 1.99
(6) [HbO2]*[PS vs. MPS] 0.88 0.20 288.55 4.32 <0.01 0.48 1.28
[HbO2]*[PS vs. control] 0.86 0.20 288.27 4.25 <0.01 0.46 1.25
(7) [HbO2]*[time period 1 vs. 2] * [PS vs. MPS] −1.10 0.23 298.26 −4.86 <0.01 −1.55 −0.66
[HbO2]*[time period 1 vs. 2]*[PS vs. control] −1.07 0.22 306.31 −4.80 <0.01 −1.51 −0.63
a

Natural log (COP velocity).

b

Adjusted for age, gender, and ethnicity.

c

Time period 1=average of COP velocity over first 8 time points (first half); Time period 2=average of COP velocity over the second 8 time points (second half).