Table 3. Regression analyses evaluating the contribution of Time, Frequency and HR complexity to cognition.

DV	IV	β	R2	F	p
Working memory	STEP 1		0.091	0.863	0.515
	Gender	−0.078			0.624
	Frequency HRV	−0.184			0.353
	Frequency X gender	−0.127			0.519
	Time HRV	0.078			0.717
	Time X gender	−0.163			0.447
	STEP 2		0.127	0.830	0.562
	Gender	−0.075			0.639
	Frequency HRV	−0.183			0.358
	Frequency X gender	−0.137			0.490
	Time HRV	0.129			0.567
	Time X gender	−0.238			0.291
	Complexity HRV	0.201			0.405
	Complexity X gender	−0.004			0.988
	Change statistics	R2change = 0.03, F (2, 39) = 0.769, p = 0.471
Focused attention reaction times	STEP 1		0.19	1.889	0.117
	Gender	−78.717			0.130
	Frequency HRV	−23.061			0.478
	Frequency X gender	9.975			0.849
	Time HRV	65.476			0.070
	Time X gender	−133.621			0.014
	STEP 2		0.31	2.386	0.057
	Gender	0.078			0.078
	Frequency HRV	0.456			0.456
	Frequency X gender	0.922			0.922
	Time HRV	0.168			0.168
	Time X gender	0.010			0.010
	Complexity HRV	0.089			0.089
	Complexity X gender	.018			0.018
	Change statistics	R2change = 0.11, F (2, 37) = 3.093, p < 0.05
Focused attention inhibition	STEP 1		0.03	0.203	0.959
	Gender	−0.446			0.575
	Frequency HRV	−0.194			0.701
	Frequency X gender	0.361			0.657
	Time HRV	−0.146			0.789
	Time X gender	−0.225			0.807
	STEP 2		0.26	1.807	0.117
	Gender	−0.136			0.850
	Frequency HRV	−0.178			0.692
	Frequency X gender	0.346			0.634
	Time HRV	−0.555			0.278
	Time X gender	0.307			0.715
	Complexity HRV	−1.597			0.005
	Complexity X gender	2.506			0.003
	Change statistics	R2change = 0.23, F (2, 35) = 5.691, p < 0.007
Decision times	STEP 1		0.15	1.417	0.240
	Gender	52.256			0.042
	Frequency HRV	−23.399			0.145
	Frequency X gender	24.971			0.334
	Time HRV	−8.687			0.616
	Time X gender	16.018			0.531
	STEP 2		0.37	3.130	0.011
	Gender	47.627			0.038
	Frequency HRV	−23.404			0.101
	Frequency X gender	26.214			0.253
	Time HRV	−23.728			0.142
	Time X gender	35.153			0.140
	Complexity HRV	−58.373			0.001
	Complexity X gender	44.063			0.060
	Change statistics	R2change = 0.21, F (2, 42) = 6.425, p < 0.004

Only effects that survived the FDA correction are reported.