Table 3.

The averaged smiles in the first session of children with autism spectrum disorder (ASD) and typically developing (TD) children (unit is seconds).

ASD session 1	TD session 1	Timing
Smile duration	Smile duration
Mean ± SD	Mean ± SD
23.7 ± 17.9	20.4 ± 15.6	1 min after entering the intervention room
20.2 ± 12.9	8.5 ± 4.9	1 min before walking with the robot
35.5 ± 16.8	16.6 ± 16.3	1 min after starting walking with the robot
28.1 ± 11.9	17.7 ± 15.3	1 min before falling of the robot
7.7 ± 4.3	2 ± 3.5	While the robot was falling
43 ± 10.1	10.4 ± 7.8	1 min after the fallen robot was adjusted