Table 1. Percentages of breaths too short to allow extraction of two inter-beat intervals for peak-valley RSA calculation in infants.

	Play	Still-Face1	Reunion1	Still-Face2	Reunion2	Time (n = 23)		Time (n = 16)
	(n = 23)	(n = 23)	(n = 23)	(n = 17)	(n = 16)	F	ηp2	F	ηp2
						2.59 †	.105	1.87	.111
Mean	9.0	5.9	10.3	10.9	12.6
Range	0.8–42.3	0–33.3	0–28.7	0–44.0	0–58.2

Note: RSA = respiratory sinus arrhythmia; Frequencies across episodes (as % of analyzed breaths) and ANOVA time effects for infants with one Still-Face Test (n = 23, df = 2,44) and two Still-Face Tests (n = 16, df = 4,60).

^† p<.10.