Table 1. The BCa bootstrapped estimates and 95% confidence intervals of zero-order and partial correlations of Tajfel matrices variables with HRV variables.

	Money allocation to ingroup	Money allocation to outgroup	Difference score of ingroup favouritism
Pre HF-HRV:
Zero-order cor.	0.25* [0.005 0.50]	-0.13 [-0.38 0.10]	0.26* [0.001 0.51]
Partial cor.	0.30* [0.006 0.62]	-.010 [-0.40 0.18]	0.27* [0.06 0.61]
Post HF-HRV:
Zero-order cor.	0.23* [0.03 0.45]	-0.20 [-0.45 0.05]	0.29* [0.01 0.53]
Partial cor.	0.28* [0.03 0.52]	-0.20 [-0.47 0.11]	0.32* [0.04 0.59]
Mean HF-HRV:
Zero-order cor.	0.26* [0.002 0.49]	-0.17 [-0.42 0.08]	0.29* [0.01 0.52]
Partial cor.	0.33* [0.05 0.58]	-0.16 [-0.46 0.14]	0.33* [0.02 0.59]

Note. Partial correlations were conducted controlling for age, gender, BMI, time of the day the ECG was taken, mood, caffeine consumed prior to assessment, general smoking and alcohol behaviour, and respiration rate.

* p < .05.