Table 3.

Post-hoc paired t-tests for pitch, yaw, and roll RMS angular velocities for mothers and infants.

	Mean of RMS angular velocity			Paired t-test
	Play	Still Face	Reunion	Play-Still Face	Play-Reunion	Still Face-Reunion
Pitch	M (SD)	M (SD)	M (SD)	t	t	t
Mothers	0.75 (0.49)	0.26 (0.35)	0.79 (0.72)	5.44**	−0.48	−5 59**
Infants	0.78 (0.39)	0.94 (0.44)	0.69 (0.31)	−1.70	1.33	3.15**
Yaw
Mothers	0.80 (0.51)	0.27 (0.36)	0.84 (0.82)	5.51**	−0.51	−5 15**
Infants	0.79 (0.37)	0.91 (0.43)	0.68 (0.29)	−1.50	1.70	3.65**
Roll
Mothers	0.39 (0.30)	0.14 (0.17)	0.32 (0.23)	5.01**	1.10	−4 38**
Infants	0.62 (0.39)	0.69 (0.36)	0.59 (0.32)	−0.89	0.44	1.66

Note: t: t-ratio, df: degree of freedom (df = 40 for Play-Still Face and Play-Reunion; df = 41 for Still Face-Reunion), p: probability.

^**p ≤ 0.01,

^*p ≤ 0.05