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. Author manuscript; available in PMC: 2016 Nov 1.
Published in final edited form as: Infant Behav Dev. 2015 Oct 22;41:127–141. doi: 10.1016/j.infbeh.2015.08.005

Table 7. Mean Rates per 5-minute Segment of Twins’ Social Interactions by Partner (standard deviations in parentheses; n = 96).

Position of Mother
Chair Floor
Partner Partner
Infant Behavior Sibling Mother Z (P-value) Sibling Mother Z (P-value)
Engagement States
Coordinated Joint
Engagement		 .64
(1.49)		 .53
(1.15)		 −0.74
(.46)		 .19
(.45)		 3.16
(3.12)		 7.47
(< .001)
Dyadic Engagement .24
(.51)		 1.47
(1.70)		 6.08
(< .001)		 .13
(.38)		 1.42
(1.70)		 6.70
(< .001)
Supported Joint
Engagement		 .39
(.73)		 .26
(1.03)		 −2.82
(.005)		 .23
(.48)		 3.15
(3.19)		 7.12
(< .001)
Onlooking 2.67
(2.55)		 .59
(1.07)		 −6.85
(< .001)		 1.13
(1.47)		 .81
(1.22)		 −1.25
(.21)
Gestural Communication
Showing .24
(.78)		 1.12
(2.18)		 5.12
(< .001)		 .10
(.51)		 2.58
(4.13)		 6.99
(< .001)
Imitative Behaviors
Vocal Imitation .18
(.63)		 .11
(.84)		 −2.28
(.02)		 .11
(.42)		 1.85
(3.22)		 6.37
(< .001)
Object Use Imitation .70
(1.63)		 .05
(.33)		 −4.79
(< .001)		 .48
(1.12)		 1.53
(2.17)		 4.85
(< .001)