Table 2. Observed means and standard deviations at pre-intervention and post-intervention for the intervention groups.

Measure	Group	Pre-intervention		Post-intervention		Within-group ESs (Cohen’s d, Pre to Post)		Between-group ESs (Cohen’s d, Intervention to Control)
		Mean	SD	Mean	SD	d	(95% CI)	d	(95% CI)
D-Prime	Contingent biofeedback	0.37	0.77	0.49	0.76	0.15	-0.21–0.50	0.40	-0.12–0.90
	Coherent breathing	0.25	0.58	0.41	0.84	0.19	-0.16–0.54	0.25	-0.25–0.75
	Control condition	0.09	0.59	0.25	0.46	0.23	-0.14–0.59
Metacognition	Contingent biofeedback	0.51	0.11	0.57	0.11	0.49	0.11–0.86	0.14	-0.37–0.64
	Coherent breathing	0.53	0.11	0.54	0.09	0.10	-0.25–0.44	-0.19	-.69–0.31
	Control condition	0.51	0.09	0.56	0.11	0.40	0.03–0.77

Note. Between-group effect sizes were calculated for the difference between an intervention group (i.e., contingent biofeedback and coherent breathing) and the control condition group, separately. All effect sizes and CIs were estimated by means of the R package MOTE (version 1.0.2; [39]).