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. Author manuscript; available in PMC: 2021 May 1.
Published in final edited form as: Infant Behav Dev. 2020 Apr 17;59:101445. doi: 10.1016/j.infbeh.2020.101445

Table 1:

Participant characteristics at crawling and walking visits

Group Crawling Visit Walking Visit
LR AR Group differences LR AR Significant group differences
Age at visit in months Mean (SD) 10.90
(1.68)		 10.81
(2.08)		 t(30) =0.13,
p = 0.90 		15.36
(1.28)		 15.36
(1.51)		 t(30) =0.003,
p = 0.99
T scores on Mullen Scales of Early Learning: Mean(SD)
Gross motor 43.25
(9.10)		 44.06
(12.87)		 t(30) =−0.21,
p = 0.84 		47.94
(2.06)		 46.07
(11.81)		 t(30) =0.52,
p = 0.61
Fine motor 52 (8.68) 52.25
(8.51)		 t(30) =−0.08,
p = 0.94 		52.56
(6.15)		 50.44
(11)		 t(30) =0.68,
p = 0.51
Visual reception 52.94
(10.14)		 57.38
(10.38)		 t(30) =−1.22,
p = 0.23 		46.25
(8.26)		 47.31
(8.20)		 t(30) =−0.37,
p = 0.71
Receptive language 50.06
(8.02)		 48.38
(10.74)		 t(30) =0.50,
p = 0.62 		51.19
(7.22)		 48.19
(10.75)		 t(30) =0.93,
p = 0.36
Expressive language 45.75
(5.13)		 43.88
(7.49)		 t(30) =0.83,
p = 0.42 		44.5
(7.96)		 39.88
(6.59)		 t(30) =1.79,
p = 0.08†
Standard scores
Early Learning Composite 100.5
(12.80)		 101.13
(13.82)		 t(30) =−0.13,
p = 0.90 		97.31
(8.96)		 93.31
(13.54)		 t(30) =0.99,
p = 0.32
†

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