Table 4. Within-individual association of infant RSA with respiratory parameters T_TOT entered in Step 1 and V_T entered in Step 2, or in reverse order, calculated across all episodes of the Still-Face Paradigm.

	TTOT (s)			VT (mL)			Multiple R
	mdn ΔR 2	range ΔR 2	freq. p<.10†	mdn ΔR 2	range ΔR 2	freq. p<.10†	mdn	range
Entered as Step 1	.014§	.000–.095	12/23	.004	.000–.037	8/23	.179	.055–.364
Entered as Step 2	.023	.001–.109	17/23	.008	.000–.039	12/23

Note: T_TOT = total respiratory cycle time; V_T = tidal volume; RSA = respiratory sinus arrhythmia.

^†frequency of positive within-individual correlations for which p<.10.

^§range of n = 126–444 breaths.