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. Author manuscript; available in PMC: 2021 Sep 1.
Published in final edited form as: Infancy. 2020 Jun 10;25(5):640–657. doi: 10.1111/infa.12341

Table 1.

Descriptive statistics for object exploration and gaze durations across sessions for LR and HR infants per 30-sec trial.

LR HR
Sit Onset Post-Sit Sit Onset Post-Sit
M SD Range M SD Range M SD Range M SD Range

Object engagementa 20.87 7.03 (6.7 – 28.8) 24.63 4.44 (10.4 – 29.4) 21.97 6.41 (1.5 – 28.3) 24.29 3.74 (16.6 – 29.0)
Grasping objectsa 14.88 7.56 (0 – 28.3) 20.48 5.99 (6.0 – 27.8) 15.49 6.20 (0.3 – 24.9) 20.65 4.71 (10.0 – 27.3)
Inspective actions
Fingering 0.51 0.91 (0 – 3.9) 0.76 1.04 (0 – 3.6) 0.60 1.41 (0 – 5.6) 0.21 0.93 (0 – 2.6)
Turning 5.94 5.21 (0 – 19.7) 6.50 5.97 (0 – 16.3) 5.57 4.91 (0 – 12.9) 4.41 4.04 (0 – 14.1)
Rhythmic actionsa
Shaking 0.51 1.52 (0 – 7.2) 0.78 0.97 (0 – 3.5) 0.21 0.42 (0 – 1.7) 0.05 0.59 (0 – 0.9)
Banging 1.25 2.31 (0 – 7.9) 1.89 2.03 (0 – 6.7) 1.32 2.28 (0 – 7.9) 1.38 1.53 (0 – 5.9)
Mouthinga,b
Active mouthing 3.40 3.37 (0 – 12.9) 7.24 5.56 (0 – 21.7) 5.16 4.75 (0 – 12.7) 6.31 4.59 (0 – 14.1)
Passive mouthing 0.76 1.88 (0 – 8.6) 0.24 0.38 (0 – 1.6) 0.60 1.17 (0 – 4.8) 1.06 1.92 (0 – 6.8)
Gaze to objects 13.82 6.35 (3.5 – 17.4) 10.41 4.86 (3.5 – 17.4) 12.92 5.25 (4.0 – 22.4) 11.24 4.28 (3.4 – 19.4)
Action & gazea
Manual & gaze 9.98 5.59 (1.1 – 22.8) 8.03 4.33 (1.6 – 16.3) 9.36 4.44 (0.7 – 17.3) 7.91 2.77 (2.5 – 12.9)
Manual alone 10.89 5.79 (0.6 – 22.9) 16.59 5.48 (8.8 – 24.7) 12.60 5.90 (0.8 – 21.8) 16.38 5.21 (7.5 – 24.4)

Note:

a

There was a significant change from sit onset to the post-sit session

b

There was a significant difference between risk groups.