Table 2 Results of the linear model predicting HRV by condition category, phase category, and their interaction while correcting for baseline HRV (N = 117).

	Estimate	Std. error	df	t value	p value
Condition category
Attention training	0.812	3.480	286	0.233	.722
Detached mindfulness	− 0.381	3.443	284	− 0.111	.914
Slow breathing	− 0.377	3.413	285	− 0.111	.916
Phase category
Post-intervention	− 2.708	2.414	471	− 1.122	.285
Anticipation	− 2.562	2.391	469	− 1.072	.266
Speech	− 1.190	2.387	469	− 0.499	.635
Recovery	4.565	2.384	469	1.915	.065
Baseline score	− 0.001	0.030	550	− 0.030	< .001***
Respiration rate	0.713	0.032	118	22.059	.979
Interactions
Attention training*post-intervention	2.416	3.427	468	0.705	.580
Detached mindfulness*post-intervention	7.031	3.392	468	2.073	.047*
Slow breathing*post-intervention	15.964	3.367	468	4.742	< .000***
Attention training*anticipation	6.011	3.424	468	1.755	.104
Detached mindfulness*anticipation	4.801	3.392	468	1.415	.155
Slow breathing*anticipation	4.563	3.363	468	1.357	.121
Attention training*speech	4.920	3.423	468	1.437	.208
Detached mindfulness*speech	5.492	3.387	468	1.621	.119
Slow breathing*speech	6.861	3.362	468	2.041	.050*
Attention training*recovery	4.870	3.420	468	1.424	.212
Detached mindfulness*recovery	5.423	3.387	468	1.601	.124
Slow breathing*recovery	9.519	3.359	468	2.834	.007**

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