Appendix 6—table 1. Bayesian regression model results of the main HBN dataset, using the specParam periodic alpha peak parameter.

Outcome	βpredictor [CI]
	Age	Gender	ADHD diagnosis	Age*gender
Alpha peak frequency	0.42 [0.35 0.49]	–0.07 [–0.14 –0.02]	–0.07 [–0.17 0.02]	–0.04 [–0.15 0.08]
Total individualized alpha power	–0.31 [–0.39 –0.24]	–0.37 [–0.42 –0.30]	0.02 [–0.08 0.11]	0.14 [0.02 0.25]
Relative individualized alpha power	0.16 [0.08 0.23]	–0.34 [–0.41 –0.28]	–0.01 [–0.11 0.09]	–0.05 [–0.17 0.07]
specParam periodic alpha peak power	0.20 [0.12 0.27]	–0.30 [–0.37 –0.24]	–0.01 [–0.11 0.08]	–0.05 [–0.17 0.07]
Aperiodic intercept	–0.56 [–0.62 –0.50]	–0.35 [–0.41 –0.30]	0.00 [–0.09 0.08]	0.09 [–0.01 0.19]
Aperiodic slope		–0.38 [–0.43 –0.33]	–0.03 [–0.11 0.06]	–0.04 [–0.15 0.06]

Note: CI = 99.17% Credible Interval; gender variable is dummy coded: 1=female, 0=male.